It's a pretty good power supply. The sad part is being non-modular, the cables tend to make the interiors of the chassis a bit messy if you do not route them or tie the unused ones properly. And at times, may be a possible hindrance to ventilation if you have openings at the bottom of the case.
I am using a M12D 850W unit myself and compared to other 800W+ units, this unit is fairly smaller and has a smaller footprint (more like a square'ish shape compared to the rectangular box profile for the rest).
Tirupati Enterprises handles the after sales service for Seasonic in the country and they are very prompt at that. I've had a first hand experience since the first 2 units of mine turned out to be DOA and they replaced it no questions asked.
Possible alternatives - Corsair TX750. Or if you are willing to spend some extra dough, the HX750.