I had never heard of true gun value until I saw it on here! It does look like a couple of guns I saw on there were shown to be about a C note lower than the current used prices around here. I don't know where they get their data, but it is better than a WAG.I always reference true gun value as well. I think it gives a somewhat accurate picture of what retailers are offering but it is a little bit lacking in regards to private sales. I have noticed a couple of listings on here that were "priced to move" so to speak lol. Needless to say they did not last long.