http://shopping.yahoo.com/merchantrating/?mid=798
The only thing I've heard bad.. (but this was from my local jeweler who was probably trying to make a sale himself even though I've been going to him for 13 years) is that they aren't too quick to tell you about the "fluorescence" of the diamond which is something that makes it glow blue in black lighting (clubs, lounges, etc). Everyone checks the 4 C's.. (cut, color, clarity, carat) that they forget about the fluorescence.