jkjeep I bought an AT Pro last week and love it so far. I bought it from NectarDetector. (Their prices are great and Rob was really helpful answering my questions on the phone--the whole transaction was excellent and I'd highly recommend them.) I've used the ATP for about 10-15 hours so far hunting a farm field, an 1800's farm site in Indiana with tons of iron trash, and a couple of city parks. I've been using it mostly in Pro mode, which gives me a lot more audio feedback than the BH. It's just taking some getting used to. So far I've already found some great relics with it... an 1800's ward gate key @ 8-10", 1926 Mercury @ 4-5", 1950's toy Sheriff's pistol @ 6-7", in addition to about $3 in clad coins.
Good luck and HH!