I'm using a McCormack DNA-1 (and a tube BAT VK-3i pre) to drive 2 2's.
For normal volumes, it sounds great! But either the amp or the speakers get rough at higher volumes. In other respects, I feel like I run out of gas with 185 respectable wpc in the McCormack long before the speakers are having difficulty.
By the way, the tube preamp REALLY helped tame the tweeter, but that probably isn't as much of an issue with the 2.3's.