Cowboom is an excellent retailer. They seem to sell off the clearance and instore demos for Best Buy. They have a 30 day no hassle return policy for any reason. They pay for return shipping. Their condition descriptions are accurate. I would equate grade 6 to Amazon warehouse "very good" and grade 7 to Amazon warehouse "like new".
Mine came yesterday. I got a grade 6. The biggest indication that it wasn't new was that the box was sealed. A new GF2 doesn't have a seal. From how the foam sleeve looks wrapped around the lens, I don't think it's ever been touched. All the baggies inside are sealed. Here are a couple of shots of the body. The greasy fingerprints are mine. How can I check the shutter count on a GF2?