Redmi note 3 in it budget segment is a beast, I am using since 6-7 months, its damn powerfull, in case of performance it can beat mobile phones of 20k.
Antutu benchmark is of 75k. its just amazing.in the market after 6-7 months.its still a best phone you can buy under 12k.
camera may can disappoint you. but its powerfull is out of words, battery back up is also superb, it can last you upto more than a one day. with heavy performance you can get up to 7-8 hours of backup.
its features also amzing.and frequent updates also provided by company.its marshmallow update is coming soon.