I dove with Aquanutz for my first fossil dive back in August. While I didn't have outrageous luck (one small chipped meg tooth and two partials, a fistful of smaller shark teeth, a stingray tooth plate, a mastodon tusk, a horse tooth, and a bunch of other bones I grabbed in fits of kleptomania), I liked Mike's operation and would use him again.
It was a 3-tanker; I believe Mike said something to the effect of "If you come up with 1000 psi in your tank, I'm sending you back down to find more stuff." I set a new personal record for longest bottom time. I had good fills on my personal AL 80s and logged bottom times of 145, 120, and 104 minutes. The deepest spot we did was only 35 ft. The first spot was actually the shallowest at 15 ft and I came up because I thought they were revving the engine; I still had 700 psi. Halfway through the third dive curling up and taking a nap on the bottom was seeming like a good idea; on my next trip I might bring some nitrox fills to cut down on the drowsiness. I definitely would not make a long drive after a day like that.