Dewey, I bought the Dymags from Richard for $1700 delivered (two-day shipping). I'm pleased with the service and price and recommend him highly. I would have preferred shipping them by slow boat, which must be at $125-$150 cheaper, but it is apparently some sort of security issue with TTS. I've bought other stuff from the UK and didn't have this problem.
Anyway, I noticed a dramatic difference immediately after putting the wheels on, although I don't have any verifiable data to support this. The bike feels, and especially turns, much quicker. It's not the biggest bang for the buck, but the pyschological and emotional payoff can't be beat. They really look great.