I've made a fair number of eBay purchases, and very few have been disappointing. But, I always read the feedback, check to see if the seller normally sells this type of item, and if it says untested assume immediately that it is broken.
I've found a screaming good deal here and there, but can say I have only had one real issue with a seller. Amazingly enough, that was over a $10 deal.
Sent from my iPad using Tapatalk HD