A mate of mine mods and tunes a lot of WRX's. I was asking him about the Kinugawas (Kando) turbos recently. He had a reasonably high opinion of them particularly for the price. He said one of their TD06's he tuned was a pretty quick car.
There is also a fair amount of internet chatter about them here in AUS. There is a consistent view from those that have used them that the quality is pretty good. Nobody is discussing failures.
If they can go to a billet wheel and ball bearing centre and still keep their costs down you'd have to imagine they'll grab a pretty decent market share.