Ran a pair of Thiel 2.3s off of a Bryston 4b-st for many years, with various preamps in front, both tubed and SS (VTL, Rogue, Plinius) -- and liked it plenty. Never compared with a McIntosh, though, so no use there. Still actually own all of it, but currently the Bryston is bridged and driving the center channel (also Thiel, and cetainly overkill) and the mains are all Rowland-fed. Bryston makes nice amps, and you can't argue with that warranty. Also not familiar with the 4b (compared to the -st and the yet more recent -sst), but word has it they've gotten more refined with each iteration. Often a fan of picking up stuff a generation or two older, particularly with amps, as you geat some great deals that way. A used -st seems to be going for less than half of used -sst gear. Yes, please.