The streacth of the river between Lambeth and Vauxhall bridges is far less developed than elsewhere in SE1. (Yes it is SE1!) Thus Kennington folk are likely to get quite excited by anything new. (Pizza Express arriving at Kennington Cross was a major event eight years ago.)
In that context it is strange and glam though even at half price not cheap. The food is a curious type of Asian fusion and the atmosphere is pink lights, odd presumably ultra fashionable music, mixed with transient hotel. So fun to visit, but I doubt it will tempt real many locals away from the Kennington Tandoori.
I've also been a couple of times. The food is very good and the cocktails are lethal, but it's a strange and slightly soulless space. The staff are very friendly and obliging, but I think I would prefer going there as part of a larger group (where you kind of make your own atmosphere) than as a couple.