Most of us with Pumaspeed stuff stay quiet on this forum.
I don't know of anyone running this, however. I'm sure someone will tell you to "just buy a S280" momentarily. The x48r probably makes more power than the smaller one. I've had great success with their older X47 (not R) and still love it.
Edit: I you are interested in a hybrid turbo, we have Whoosh Motorsports making them in the US. Support will be more convenient. I had great support experience with Pumaspeed but shipping and exchange rates can be time consuming and more expensive.