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REVIEW / Lenovo IdeaPad Flex 15, Mid-Range Convertible Laptop

Good concept goes to waste on a terrible screen

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Bénigne Millière Published on May 2, 2014
Updated on November 5, 2014
Translated by Hugh Ehreth


  • CPU Intel Core i5-4200U
  • Graphics chipset Nvidia GeForce GT 720M
  • RAM 4 GB
  • Screen 15.6 inches, 1366 x 768 pixels
  • Storage space 500 GB
  • Optical drive NA


The Lenovo IdeaPad Flex 15 is a mid-range 15.6" laptop that's equipped for multimedia- and basic task-oriented home use with an Intel Core i5-4200U, a 500 GB hard drive and a tiny Nvidia GeForce GT 720M graphics card. What's unique about this laptop is its hinge that allows it to flip into Stand Mode, as shown below.


Ideapad Flax15 present1
Ideapad Flax15 present2

When closed, the IdeaPad Flex 15 looks like a Yoga 13 with its black soft-touch plastic lid and chassis; the sides are a dark grey. The only thing that sets it apart from its older 13" brother is the black aluminium palm rest when the display is open. But whereas the Yoga 13 can flip into four modes, the Flex 15 only switches between Laptop and Stand modes. The transformation, however, is just as simple and reliable as on the Yoga 13. The hinge breathes solidity and appears to be the same type of hinge as the Yoga. The Flex 15 fulfils two needs: productivity in Laptop mode and photo viewing and film watching in Stand mode. The touchscreen is responsive and precise, making for a comfortable user experience.

Ideapad Flax15 clavier

The chiclet keys are well sized and offer nice resistance and a supple rebound, making it a pleasure to work with. The spacious touchpad is precise and recognises all of the Windows 8 touch gestures. In Stand mode, the touchscreen is closer to you, making it a good way to put Windows 8's touch-happy ethos into practice.
Ideapad Flax15 conn gau
Ideapad Flax15 conn droit

The ports are satisfactory: one USB 3.0, two USB 2.0, Ethernet, HDMI and a headphone/microphone combo jack. There's no DVD drive, which is a shame given this model's multimedia focus. The wireless connectivity consists of Bluetooth 4.0 and Wi-Fi b/g/n. We measured the Wi-Fi signal at -47 dBm from 5 to 10 metres away and -52 dBm from 20 metres away.

Ideapad Flax15 temperature(1)

The heat dissipation could be better, as we picked up temperatures of up to 38.2°C on the left side of the keyboard and up to 49.7°C around the air vent on the underside of the chassis. Part of the cause of these warm climes is the fan, which doesn't expel hot air fast enough; the upside to this is that it stays quiet at a maximum of 38 dB(A).


The glossy 15.6" touchscreen has 1366 x 768 pixels, and is simply a terrible display, starting with the low contrast (424:1) and maximum brightness of 209 cd/m².
Adora temperature couleurs(1)
Grey colour temperature
Msi Adora gamma
adora delta E
Delta E

And then it just goes from bad to worse. The colours are all over the place with a Delta E of 12.9 (the requisite three or below in order to have faithful colours is quite far off) and an astronomic colour temperature of 20,263 K (light years away from the ideal 6,500 K). In other words, if you plan on buying clothes online, don't do it using an IdeaPad Flex 15, because the colours won't look anything like they did on the computer screen when you bought them.


The sound quality is standard for a mid-range laptop. The speakers located on the bottom won't wow any aficionados; there's a good deal of power, but not enough bass or highs, and some major distortion. They're fine for listening to talk radio, skyping or those little "dings" for the Windows error messages, but that's it.
Ideapad Flax15 audio

The in/out combo jack is satisfactory with an adequate stereo image. The power, distortion and dynamics are all average.

Note: The model we were sent to review features an Intel Core i5-4200U processor, 4 GB of RAM, an Nvidia GeForce GT 750M graphics card and a 500 GB hard drive. The comments above refer to all versions of the Lenovo IdeaPad Flex 15, whereas the sections below apply only to the model we tested (see inset below). Available configurations may also vary depending on the country/region in which you live.


Our model's configuration (Core i5-4200U and a mechanical HDD) obtained a score of 77 in our in-house rating system, which places it smack-dab in the middle in terms of performance for a convertible laptop.

Performance Index

Ideapad Flax15 perfmachi(1)
Click for details

If you look at the performance achieved on laptops that contain a solid-state drive (such as the Samsung Ativ Book 9 Plus), you can see a clear difference between systems that don't have an SSD, due to the slower access speeds. A good compromise for the Flex 15 would have been to use an SSHD instead of the HDD.

Our model of the IdeaPad Flex 15 is good at performing simple tasks such as word processing, web browsing and small-scale photo editing, but for bigger tasks such as video encoding, you'll have to get used to waiting.


Lenovo the gave our model an Nvidia GeForce GT 720M video card, which did not perform well in our standard tests.
HP graph gpu

It's more or less equivalent in performance to an Intel HD Graphics 4400: it will run Windows Store games fine, at which point Stand mode comes in handy, but for bigger games, only older or independent titles will run with adequate gameplay. HD videos, however, decode perfectly.


We got the IdeaPad Flex 15 to last 6 hours in our battery test (continuous video playback in airplane mode with the brightness at 100 cd/m² and headphones plugged in), which is quite good for a 15.6" laptop. Of course, at this size it isn't as easy to tote around as an 11" or 13" machine.
Models, specs & options
Lenovo is selling two different versions of the IdeaPad Flex 15, both of which differ slightly from the model we were sent to review.
  • £549.99 model: Intel HD 4400, 4 GB of RAM and 500 GB HDD
  • £629.99 model: Intel HD 4400, 8 GB of RAM and 1 TB HDD
Our model features an Nvidia GeForce GT 720M, 4 GB of RAM and a 500 GB HDD.

Unfortunately, the chassis does not open up to let you change components like the HDD or RAM manually.


  • Build
  • Battery life
  • Keyboard
  • Stand Mode is a good way to use the touchscreen


  • Overheating
  • Terrible display


The IdeaPad Flex 15 is an affordable touchscreen convertible laptop that switches into Stand Mode to become part-tablet, part-laptop. It's a great concept that Lenovo has already used on the Yogas and Yoga Pros, but here it's gone to waste due to an utterly catastrophic display (low brightness, low contrast, exaggerated colours...).
2 Lenovo IdeaPad Flex 15 DigitalVersus 2014-05-02 15:10:00
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Store Available Price £ 493.60 See offer  
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John Lewis 549.95 See offer  
Laptops Direct 549.97 See offer  
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