rachel123 - 3:25 pm on Mar 4, 2010 (gmt 0)
I wouldn't buy from either of those sites. I always look for at the very least, 90% good reviews. A site with 15 reviews should have no more than one negative (for me), and a site with 500 reviews, at least 450 of those if not 475 better be positive.
Now that I think about it, the more reviews a seller has, the less wiggle I give them in terms of percent negative. If a store has very few reviews, one or two bad ones might just be an anomaly; because the n is so low hard to tell what the actual track record is.
However, if I see something that says 10,000 reviews, 66% positive - that screams that this company has systematic failure issues.