Here's a link to the item on Wiggle:
http://www.wiggle.co.uk/cycleops-powertap-pro-hub-only/
I previously had it built into a Dura-Ace C24 since July last year (when I purchased it new from Wiggle) and have had no issues at all, it's always provided consistent power data.
It's just had its bearings replaced at Cycleworks, unused since.
Shim/SRAM
Hub Only!
£300
CycleOps Powertap Pro Hub Only - 20h/Shim/Sram
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