I own a pair of 2.3s. For a few years, I've paired them with a 60 watt VAC Avatar tube amp. Nordost SPM ties everythng together. Absolutely loved it. Even in triode (30 watts). This in mid-sized typically damped room.
By the way, VAC and Kevin Hayes is another class act.
Then, in part due to listening to all the posts about the Thiels needing mucho power, I succumbed to the upgrade bug and the heady excitement of the Audiogon auction. (I agree that the Avatar didn't provide the punch on the low end this aging rocker missed.) So - now I'm using a CJ Premier 16 and Pass X250. Now have a little more and tighter bottom end (the sound, not me!) and a more truthful mids/highs, but you know, I sometimes miss how my Avatar would lie to me. There are some things I just don't want to hear!
So - I guess I'm saying that the Thiel 2.3s need SOME power - probably no SETs should apply - but the quality of that power is more important.