I bought Redmi 1s last year from flipkart and its been a great phone!. After using this phone for about 1 year I can conbclude some pros and cons like
PROS:
Hardware installed is good, it is like a beast trapped inside a phone .
Build quality is great, not like the delicate phones coming these days and also does not feel like plastic .
Bought it at an unbelievable price
Many built in apps come with MIUI.
CONS:
Earlier it had some heating issues but they were solved with the update.
Updates are very less, Redmi 1s is still running on kitkat:(
MIUI slows the phones down and it takes a lot of RAM, some other ROMS for rooted redmi 1s perform better .