Powertap may not be the slickest unit out there, but it has several major advantages:
• It's proven
• It's reasonably priced
• It can be used on multiple bicycles (I have three I'd like to set up for the PT)
My plan now is to get a set of Zipp 404 clinchers with a PT SL rear hub. That will work on a number of fronts. I have a local acquaintance who may be selling a Zipp 404 clincher rear with a PT SL soon. Hard to find them on eBay. I may splurge and by the set with the PT new early next year.