I have bought mobile phones from univercell for more than 6 years. They have a good collection of models. I have also asked the staff to demonstrate certain features of a mobile model I have chosen and they obliged.
The prices are also good. Generally they provide good offers during Aadi sale and New year. When we ask for certain specific features, the staff provide us with alternative brands so that we can select the one we are comfortable with.
Recently we were even offered a friendly EMI option based on the Credit card we used.