I think nobody could be disappointed with the depth of the Safari. In my air test, it gets a dime strong in discriminate mode to 11.5" so there's probably about no difference in depth between 10-20 or so of the best detectors ever.
There are many, many detectors made over the last 30+ years that have found a 10" deep coin or two. Many of the Minelab owners get those really deep coins more often (but the X-Terras are less deep IMO).
I got a used Safari because it has fewer adjustments than an Explorer & since the detector was only recently released, I knew the detector wasn't likely to have problems. Also ordered a Swingy Thingy (bungee harness) as I am not strong & the detector weighs 5.5 lbs w/batteries. Best wishes, George (MN)