I have had using Lenovo K6 Power for last 2 Years,
Pros
Awesome Built quality
Decent camera
Dolby atmos speakers are the best
Battery life is outstanding.(4000mah)
Cons
Earphones are not up to mark
Heating issue is there when you are in net with lots of apps running simultaneously
Very smooth back panel, without back cover its bit difficult to hold.
With two SIM cards one cannot extend storage capacity
So to round up. Its the best budget smartphone in under 12k.