definitely a performance aspect.
the fitment issue is a non-issue.. takes all of 5 minutes to dremel out the stock plastic holding tabs and they will fit. (or some lazier people zip tie them together...)
The performance of the 9mm are not "bad", they are good, IF they are good.. I think the bias is more due to the QUALITY of the wire, not performance of the wire. (when you get a bad one, it sucks.. and people "happen" to get bad ones more often than I care to take a chance with.)
Ray
