There is a guy who has posted a 3 part series of videos on youtube comparing the Safari to the Garrett AT pro. He uses an old 10 inch explorer coil on the Safari and has it in AutoSensitivity. The AT is set at one notch from the max. I am a Garrett fan and think the AT Pro is a fine machine. It has a lot of great features, but being deeper than the Safari is NOT one of them.
https://www.youtube.com/watch?v=DxZ6nSMai18
https://www.youtube.com/watch?v=DxZ6nSMai18