Who here has used a Powertrain Technology hydraulic throwout bearing?

I have a Keisler Engineering hyd TO bearing in the Dart (over 10 years old). When Keisler went belly up several years ago, two companies were born: Powertrain Technology and Silver Sport Transmissions. I can't comment on Powertrain because I've never contacted them, but SST was very helpful when I called. The Tremec wouldn't go into gear and I thought it was the TO bearing. Talking to their tech staff at length, turned out the master cyl at the firewall needed rebuilding. Cost me $60 instead over $300. And BTW, love the hyd TO bearing; easy to shift, positive engagement. Even with the high-winding 360, my wife can shift with ease.
TREMEC 5-Speed and 6-Speed Kits: Silver Sport Transmissions