Mi A1 is a device which comes under Android One program by Google that’s why it runs on Stock Android, not on MIUI. The built quality of this phone is good, it has metallic back.
Although it has a single speaker but the sound quality really good. As it is a part of Android One Google will give updates for 2 years. It is running on 7.0 Noughat but you can update it on Oreo 8.0.
It also has a headphone jack which gives good output. It also has IR blaster using which you can control your television, Air conditioner etc. But it does not have NFC support. The fingerprint at the back is little slow.
The RAM management of this is really good and you can easily play heavy games on this device easily. Battery life of this phone is also quite good. The camera performance is really good in daylight but not in low light the performance is not that satisfied.
Also, this does not have FM support. This phone doesn’t support fast charging. It also not has stabilization while recording videos.
Use HDR mode while clicking photos that make a difference in the quality of photos.