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.
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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...