Vibe X3 is a very good phone from Lenovo. I bought the phone when it was launched. This is a premium phone at an affordable price. Biggest advantage was the battery backup. Once charged fully, it will go on for minimum 48 hours. 21 mega pixel rear camera and 8 mega pixel front camera. It has 3 GB RAM and 32GB storage. The phone is good with rich features at a less price of about 20k.
The only problem was with battery backup after OS upgrade(Android marshmallow). From charging once in 2 days, it was twice in a day. Now the battery drains more quicker. However, I would recommend this phone. This has been a stable phone and no hardware failures or software crashes yet.