The Taurus Thunderbolt is legal in all SASS categories except Classic Cowboy/Cowgirl, as it's a replica of the Colt Lightning rifle. I've had a .38/.357 CCH on order for almost a year, and it looks like Taurus will be cranking up to manufacture them in that caliber in another three months or so. So maybe I'll have my gun in about six months.....
There's quite a few Thunderbolts in .45 Colt out there now, and most reports have been pretty good. The folks over on the SASS Wire have reported a few of the early ones had problems, but the Taurus warranty appears to have worked pretty well; some rifles were even replaced rather than repaired.