I own micromax Q2.
It is a nice phone. But dont expect the quality of bigger brands.But it never let me down.
Happy with it.
And will be buying a Q75 soon..
If it is for your mom,i wont recommend the Q series.
And saying about their service centers.But i doubt their knowledge.
I got a replacement for my Q2 when it had some headset problem(That came from my fault).
They said they can't repair it and for 1 week i had to call them continuously to make them check my phone and finally they gave a replacement. They were saying they were not getting enough repair parts from micromax.
Even after all these i liked the phone's reliability. So it is k.