I'm also a huge fan of their regulators. I have their doubles wings and they work just fine. I've been less than satisfied with the customer service lately, unfortunately. I've had issues with three SPGs now in rapid succession and Chris has been very slow to return emails (read: he hasn't returned any emails for two months while I've been encountering this problem). I know it's BTS and dive show season, so I'm hoping he's just busy.
Overall, very happy with the gear. Having some trouble with the gauges at the moment, but I'm sure it'll get sorted out eventually .It's good to know someone is using this with STA. I might pick one up to try it.