Descent specs, but front camera broke after a month, and the software felt too much like an iOS clone. A lot of unwanted software comes pre-installed. The software doesn't take full advantage of the hardware. The plastic back feels cheap, and found a lot was left to be desired in terms of dev support.
The battery was defective and impossible to replace because everything has to be shipped in from China. The adapter has a strange 3 prone plug shape and does not fit any conventional plug in North America.
I had an iPhone 5s before and chaged for this phone because I think the Apple products are very expensive. Despite the fact that the MI4i is not so fast as my old phone, I loved it. It is one of the best cost benefit in the market. The Android system is very good as well. I really recommend this phone.