I got screwed by a guy with less than 30 posts a few years back but luckily Paypal refunded me my money. Also got screwed by "Uncle Tony" when he sold me a rusty spare tire well to replace my rusty spare tire well.
Other than that everyone has been great. In fact I've had 2 or 3 guys send me parts for free, despite us never even having a prior correspondence. Most people here are really good people.