I use vistaprint for the free ones, find quality is ok, the only criticism is that the size is not right, that is its a bit different to a normal card - however if someone gave me one of these whether it was a binman or a solicitor I really would not give a sh*t about the size (and no, bin men round here don't give out business cards before anyone pipes up..).
Don't read too much into the little details mate, it's really quite insignificant as long as the spelling is all OK and they dont look like they were designed by a 4yr old.
Ash