I have bought several Detector Pro products ( machines, headphones, etc.) and never had any problems with any of them. The HH PI with 8 inch coil is one of the best PI's out there for wading, hunting in bad weather, etc.
I don't dive, and I think a lot of divers do not like them due to some units leaking.
If a person is getting into the hobby, wants a light weight, easy to use, all weather machine, I always tell them to look at the Detector Pro Wader. It's one of the best all around units that will hunt dry land, salt water beaches, hunt in rain storms, etc. for anyone.
If they want to go underwater, then there are more robust units to choose from.