I had bought K3 Note, on Flipkart through flashsale around 6 months back for my brother. This is a indeed a good phone in this price range. Though there are quite a few cons as well. The following are my observations:
PROS:
Dual SIM
Full HD display
Smooth touch
Light weight
5 Android 5.0(most phones in this range comes with Android 4.4.4)
Good camera quality but have isses regarding far images
Screen guard comes along the package
Smooth video play
Multitasking works perfect without any lag.
Good sound Quality
Fits in your hand nicely
Faster than any other phone like Moto gen 2nd generation, red mi note
Cons:
have serious issues regarding WiFi connectivity.
Only 1GB of RAM is remaining out of 2GB.
Front camera quality is disappointing.
3000mAh battery not sufficient for the phone, battery drains fast.
Charging time is high.
Doesnt feel strong in Hand, build quality could have been a bit better.
The wallpaper becomes black when I switch from an apps to homescreen
Doesn’t provide ear phone
Absence of gorilla glass
This phones sucks in gaming department(tried playing asphalt 8, modern combat. its horrible, lags like anything)
Overall I would say its worth value for money