Now its been a year since I am using Redmi 1s and till now it has not given any problem. Redmi 1s has a 4.7 inch IPS display.
It has 1gb of RAM and 8GB ROM. It also supports Micro Sd card upto 64gb. It is a dual sim phone.
The Camera of Redmi 1s is of 8 Megapixels rear and 2 Megapixel front camera. It comes with Snapdragon 400 processor which is a Quad-core 1.6 GHz Cortex-A7 processor. The battery is of 2000 mAh. The GUI of the phone is great as it comes with MIUI 6 and now its updated to MIUI 7. Overall the phone is good with comparision to its price.