It is all in how carefull you are. But even then, you can still get bit.
I habe made almost 100 purchases and used to have a perfect rating. I bid on, and won, a setup for communicating with my cell phone through the computer. It was the cable and the software from Motorola. Good price, great feedback.
I get the package and all is OK. The cable is Motorola OEM. The disc, however, didn't look exactly right. I attempted to load it and it failed to load. 4 hours later I call Motorola for support, and eventually discover that the CD is bootleged.
Fortunately I had not left any feedback yet. So I tried to contact the seller; no answer. So I leave a negitive feedback; he blasts me for lying and being a sore bidder.
Well, two weeks later I look at his feedback and he has 20 or so negitives for that very disc. I just happened to be the poor slob who was first to catch it.
Oh well, lesson learned.
Ed