I have a set of Shimano 7700 wheels and I like them. Fortunately I only paid $150 used.
I tour on my bike and I would not use them however. I'd take my good old 32 spoke wheels. I was on a week long ride and a rider had a problem with a fancy wheel. He rode in a car for 3 days until we got somewhere with the Campy parts needed.
I think when it comes right down to it the answer is: 6 or a half dozen. A case can be made either way.