Most of my experiences have been very good.
Bought the Falco itself for £3k with 6k miles and FSH, 3 years ago, when they were generally going for at least £4k private.
Also got a pillion seat hump (as new) in black for £50, (other colours like red always seem to go cheaper), but Aprilia want nearer £150 so not bad.
White spring shock as new for £38. (Well happy).
Also last year, after the off, an almost complete set of body work in black (off a bike that had never been on the road and converted to a Falco Fighter before selling), this also included new standard exhausts, rear can/pillion hangers, both clip ons, all indicators, (including a standard rear numberplate!!!), dozens of stainless fairing bolts, std. screen and all sorts of other stuff for £520 odd. Did not need all this but saved my life as the panels/bits I needed would have cost at least £2800 from Aprilia.
Bought numerous other bits over the years and never been really stung.
My only bad experience was 3 years ago, when I bought a Fazer 1000 outside ebay, as I was highest bidder but below reserve. Agreed a price with the seller, got insurance sorted and was going to pick it up the next weekend, then got an email saying that he had had a better offer and sold it locally. I was gutted.
I found the Falco on ebay 2 days later and bought it, and have never recovered from the terrible set back of missing out on the Fazer !!
THANKS Ebay 
