I own Lenovo k3 note since a year now, it is great phone for the amount we pay for it. Camera quality is good. not great but fine. It is not fragile at all, I have dropped it quite a few times till now so I will give it a thumbs up for the same. One thing that bothers me is that the RAM is too low. Cell hangs a lot of time and mostly its due to the in built apps.Yes they are helpful but then many of them eats up all the RAM and hence the experience is not that smooth.
The major concern is an in built SEARCH app that has been bugging the cell and it cant be disabled. All the safety walls, antivirus detect it as threat but since it is a in built app, it does not go.
Other than that, its a great value for money with all the features of leading cell phones.