Something also bugs me about the Daytona-based UnderCoverTourist site, as they say they have a Florida 'Sellers of Travel' certificate (a state requirement for any travel business over there) but don't display their registration number anywhere on the site that I can see. Their list of Terms & Conditions is also huge, and contains several 'get out' clauses which would worry me. I will investigate further!
Just wondered if you'd managed to find out anything more about this company Simon, as I keep seeing their name all over the place!