Looking for new wheels and have noticed various offers relating to wheels built with Mach 1 Rims. The prices suggest that they are too good to be true (no pun intended) when compared with the more common Mavic combinations. When you see a pair of XT's for under £80 one is torn between bargain and whats the catch? Or as I suspect, better to spend £140 or so with a more normal rim. LBS made a handsome profit on my last replacement rear wheel, by charging me £90 (ouch) for one Alivio-Mavic, when I was in a hurry, so looking much further afield this time eg. Spa, Merlin, SJS etc...