If you want phone with good battery life just go for it. This phone is best if you want second android phone with good battery life. This phone is not made to give you high end performance. There are lags and User Interface is very bad. But I use this phone only for battery purpose.
Pros:
1> Battery is 4000 MAH and work almost 3 to 4 days if you use wifi normally for 5 hours in a day. If you use it regularly it will give you backup of 1 and half day. But thanks to lenovo for giving it fast charging support.
2> Display is very crisp and clear and colors are very bright. This is another best thing I like about this phone.
3>Supports dual sim with memory card slot and even 4G bands.
4> You get back cover inside box and it is of very good quality as well.
Cons:
1> Heats a lot while charging or heavy use.
2> User interface is very bad and confusing.
3> Faced enough lags after lollipop update given by lenovo.
4> Camera performance is very bad.
Only recommended if you want smart phone just to use like as basic phone . Because if you do not install any app and use internet on this phone, it works for more than 5 to 8 days.