I ran the Tannoy Revolution RC with my CS3.6s for a while. The sound match was good.

I listened to a few different centers with the 2.3s that were at the shop including two from Thiel and preferred the sound of the Tannoy over the low-end Thiel, though the high-end Thiel ($2K, if I recall correctly) was a bit better, but it was WAY too big for my environment.

In the end, I've returned the Tannoy for aesthetics reasons; I'm going to Niles DS6500ATs in the ceiling for all the surrounds.

I'd recommend the Tannoy for sound and price, especially as a match with the Thiels.