Didn't use it, but I saw it too and it is interesting, but I don't like the silvery front, just isn't "original arcade" IMHO. And I'd have to either make a big hole in my door (that would be difficult) or get a new door. The mech has a good price though.
Suzo has a simular unit (
http://www.suzo.com/suzo/product.asp?nP=11537) that can be used with the "traditional" door fronts we are used to, but it's a bit more expensive.
My currect coin mech is still for Dutch Guilders (and I don't even know if it works) so I will have to change it for a Euro mech, but I'm still in doubt. I like the sound of the mechanic accepters. But it's very handy, I admit, to be able to put in any coin you want it to validate....