Back in 2008 I purchased the Klipsch Quintet II 5 speaker setup and I really liked their sound. However I found the center channel sounded quite different from the single driver satellites. Recently I found another Quintet setup in a thrift shop for very little money so I purchased it. I replaced the regular center channel speaker with another satellite and, since the sub-woofer did most of the heavy lifting I didn't hear any strain in the undersized, but equal to all its neighbors, new center channel. And the improved seamlessness of the sound made the change quite worthwhile.
I like the sound, but I bet I'd like several of the other setups I've read about in this list more. I do really notice the improved quality of having all 5 speakers being exactly the same. There is no change of timbre in shared instruments, voices.