The sand shark is all I use right now. The machine is simply great due to it's ease of use. Turn it on, start digging.
You will find yourself digging deep holes for little things. One hole, at least 10" deep in the surf was driving me nuts. I could tell that whatever was causing the tone was easily slipping thru the scoop holes. I usually get bobby pins that do that. I finally scooped it up and dug thru the wad of sand by hand. It was the little gold back of an earring, that little thing that slides on the post.
That convinced me that if my detector goes over the top of anything metal, I'll find it, and I have. Yes, I too get tired of digging iron, sometimes. I've dug up some old spike/nails and have found hunks of worm eaten wood nearby in 18 feet of water. That is what gets my blood pumping a little.
When the Sand Shark barks at me in the surf I dig about 4 good scoops. If I've not dug it up by then I pretty much leave it. It's usually a hunk of rusty crab trap parts. This, of course, depends on where I'm at and what I'm digging for. When hunting modern beach fodder, 4 scoops is about all I'll dig on a target.
Do I do a bit of extra digging? You bet. Will I get an excal one day? Probably. I just really like my Sand Shark tho. The price is very affordable for what your getting, even on a new machine. There is a place I have to walk about a mile on the beach to get to from the parking area. With the coil out front I balance the detector on my shoulder. It's balanced so well that I can walk the mile without touching the detector.
It's a joy in the water. The white coil helps you see where to dig in cloudy water. I can swing this thing all day, with ease. The Shark requires no modifications. Use it as is. You don't have to buy anything extra to make it comfortable.
It's a simple honest very well built machine. I say 'go for it' until you get your Excal.
HH