I've seen some decent prices on used wheels built on Power Taps, on Ebay, and I wonder if these are a good idea.

Overall quality as a hub? I've been using a 2006 Campagnolo Record hub.
Quality of the bearings?
Maintaining bearings?
Are there any non-recoverable failures?
Is there a cadence sensing feature? What models?
compatible with Wahoo Elemnt?
Can a Campy-compatible freehub be installed?
Do they have any constraints on lacing? I'd swap a 32 hole Mavic GP4 tubular rim over to it.

The bike's a bit vintage, but ... I'm fine with that. It's a 1984-ish Mondonico, now running Campy 2x10.