I do not think the A2Z adaptor is garbage, but for me it was, for what it offers, overprized – so I produced my own adapter (12 USD):
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130393104283&ssPageName=STRK:MESE:IT
It is true that in most cases, you need bigger rotors. But most of the times you have to buy the brakes anyways and it does not hurt to ride on 180 rotors, does it?
I still try to figure out which brake calipers are useable – in case of small hardtail frames. But at least you have more options than the one hard to get Hayes modell!
For the Woodman VRX adaptor I found several offers in the UK – as usual – for around 40 – 50 USD incl the S&H.
Ride on!