No, not me.
And I must admit to going against my own advice in this regard.
I have recently upgraded all of my live gear (Behringer PMP 1280 mixer/amp plus three pairs of speakers and one set of cables) through E-bay with no faulty gear at all.
The Behringer dealer (not Behringer) lied on the Customs Declaration which resulted in the amp being held at the border for 2 weeks but other than that, no problems. I just won't deal with those guys again.
I think that there are enough safeguards in place, both by E-bay & Pay Pal that the risks are low but if something does go wrong, it can be slow to resolve. (waiting time)
I am aware of all of the risks but in all honesty, choosing the same gear and going with whichever brands I can get locally, I probably saved about $1000.
That's how much I spent in total.
The speakers may not be the same quality, I'll never know but when I can get a pair of 12" speakers for half the price of one speaker, I'll take the chance.