Infinity RSa... about a week, hah. But they make my Celestion 11's sound shouty, rude, inaccurate, unrefined and downright cheap by comparison. I've had those since July or so, and they've stacked up well against everything I've compared them to.
There's just no contest. Better imaging, clearer and more extended (but not louder) bass. Not quite as dynamic as the Celestions, but almost equivalent anyway.
Vocals sound like they might be lacking a bit, but with my tastes tending ever further towards instrumental music this is becoming less of an issue. The EMITs are laser-sharp, too - the Celestions' metal domes always made a cymbal tap sound more like a 'click', with insufficient dynamics and decay. As stated elsewhere, I have heard my audio future, and it is planar.
The Celestions are vinyl wrap. The RSa's have oak veneer. 'Nuff said.
I'll never get rid of the RSa's. They sound too good (and there are also more important reasons for this relating to the person I obtained them from).
Meanwhile, the Celestions may be destined for eBay. The Dynaco A-10s continue to hang around due to space constraints.