While there is a timbre difference with this center I hear folks rave about it matched with the heritage stuff. I use Heresy for main and sides, and put a heresy as center (actually ended up with two Heresy on their sides with tweeters in middle) and had a great effect. Asthetically it was not pleasing and a tad too big, but sounded great.
A heresy matches pretty well the timbre of the cornwalls (I believe some models have exact same sqwuaker and tweeter) and would be a good sound if you can pull it off.
Currently using an Acoustic Research that is far better than the Infinity I had before (a not bad solution). I am reengineering the wall to see if I can get the Heresy stuff back into play - probably take the tweeter and mid horn and package in a seperate box.
I thought about just buying 1 Heresy for a center, but I've seen people using them that way and they kind of look like ass sitting on top of the TV. (no offense please)
Needless to say the BOSS wouldn't go for that.
I have heard from someone that kept crossovers, tweeters and sqwuaker from Heresy and put in a more pleasing box for top of the set. All sounds good, except where do you get down to the bass management crossover - I assume some sort of cone, but haven't gone there.
Try your question at http://www.klipsch.com/index2.html
they should be able to give alot of help on there forum.