I can’t comment on how quickly they ship preorders, but I’ve had great service from them before, and posted plenty of deals from them in the past and never heard any complaints.

Basically, if I’ve not said anything about the reliability of a retailer I’ve posted a deal from, it’s safe to assume that I am vouching for their credibility.

Edit: Actually, now that I think about it, about 3/4 years ago they did sell some unsealed goods that weren’t marked as such, but I think they have cleaned up their act since then, and that almost certainly wouldn’t be an issue for brand new games anyway.