I love my AT gold.I sold my GMT it was just way too noisey in northern CA gold country.
The gold bug is extremely sensitive to tiny gold but also is unstable or chatty sounding.The AT gold is sensitive to very small gold,waterproof,very stable in almost any situation(not saltwater) ,excellent at coin shooting/parks and tot lots this machine is a ring/jewelery grabber.I know I will take a beating from some forum members for this post.Please remember that I have used all of these machines and the AT gold best suits my hunting style and believe this machine is very underrated and it can do almost anything.