Okay, I can't stay silent on this one. The Tiger Shark is one great water detector. Maybe there is better but I don't know because I have never used anything else and probably never will. I think it is safe to say that in it's price range there is nothing better. For me it came down to buying a dedicated water detector for the water and dedicated land machines for land use. This was on advice of Sandman and I am glad I listened to him.
Every time I use the Tiger it amazes me at the stuff it finds. Small chains and earrings are no problem for the Tiger. I hunt in disc mode with the disc set around 2-3, but never higher than 3. The only time I get it up near 3 is a few spots with tons of small nails. It is deep in disc. mode and in all metal with a slight threshold hum it is unbelievably deep. In my opinion on land in all metal it is the deepest Tesoro made. My Tejon is a depth monster on land, the Tiger in all metal is mind boggling. Bear in mind in this mode it is a dig all situation on land, probably comparable to a PI.
I have the 10" coil and prefer it for coverage and depth in the water. In the water you are in a dig it all situation if want to be successful. Because of this target separation is not overly important. Despite the larger coil it separates really well.
Pinpointing is dead on and the audio is awesome. To get the goodies in the water you have to scoop trash to get cash. The Tiger loves bottlecaps, but that just comes with the water game. With enough practice you can tell a tab by the audio.
The coil slices through water so smoothly it is almost effortless. Most importantly the coil is not buoyant. The Tiger is perfectly balanced in the water.
It uses 8 AA batteries but they last a long time. My best guess would be 40 hours per set. At three beeps I replace them.
The headphones are great, comfortable enough, and can take a dunking no problem. I say comfortable enough because they comfortable, but not like a good pair of Grey Ghost on a land detector.
Hope this helps. Don't ask to buy mine, it's not for sale!