I've been using this phone for a month and a half now.
Well firstly let me tell you why this potentially high-end phone is priced at around 15 K,this phone has a screen size of 5.5 " at a resolution of 540 x 960 Pixels,which isn't the best resolution for a 5.5" phone,it will seem a bit less sharp than a Note 2 because of the lower pixel density but then again,it's nothing to complaint about considering that this phone never hangs or freezes or lags.
I've tried all sorts of applications/games,not once has it died on me.
It boots pretty quickly even when you un-check the 'fast boot' option,all thanks to the 1.2 Quad Core processor.
Lenovo has installed a pretty neat UI which is very easy to browse through and experiment with,one feature that has proven to be very handy is the 'tethering' option available on this phone,you can share your phone's 2G/3G to other phones (i.e if they support Wi-Fi),you can share it with your PC, via. Wi-fi or USB and the connection is very stable.The device doesn't heat up or burst into flames,nothing of that sort,it just does it's job without creating a drama.
The battery life is slightly above average,the touch response is brilliant and .. oh,there's one more important thing that you need to know,unlike the low-end android phones which run on ICS or GB,you absolutely cannot move your apps to memory card unless you root this device.You see,in some android phones,you can download an app like AppMgr 2 or 3 and move some of the apps from phone mem to memory card even if the phone isn't rooted but on this.. you cant!! It just doesn't let you,the only way to do that would be to root your phone,you get around 2.something GB to install your apps,which according to me is pretty sufficient.
The camera is .. well quite basic,it has a lot of features to play around with and it's auto-focus is pretty sharp but the camera itself is shy when it's asked to shoot in low-light environments.Apart from that it's very neat.
To sum it up,this is an amazing device with little or no hiccups!!
It wont disappoint you .. unless you are a relative of Steve Jobs!!
Cheers!!