1: Digging on the beach is not that hard, and its easy to cover holes. So yes, dig, scan, dig scan until you have the prize.
2: I have tried using the Excal2 on land, and it is a pain. Best bet is to keep your land machine and have 2 detectors to choose from depending on your hunting evniorn.
3: I have no problem with the Excal2's headphones. Used them for 5 or 6 hours at a time before.
4: The Excal2's tones are not foolproof, but they do give you a slight indication as to what may be down there. The only way to be sure is to dig. Again, its a beach and digging is easy.
5: As far as I know, there are no AA options for the Excal. The NiMh battery is very good, and works exceptionally well. If you keep your curent land machine, you'll eventually use the batteries with that one on your land hunts.
6: There is a trick to the Excal for pinpointing. Once you identify a target, sweep the coil left and right until you identify where the item is on a left to right basis. Once you have the centerpoint for the item, slowly move the coil torwards you, or away from you. When the target no longer makes a sound, then it is about 1 inch byond the coil, which will depend on which direction you move the coil. Just insert your scoop 4 inches behind the target and dig. I have only been using my Excal2 for a few months, and I have become very proficient at pinpointing. With practice, you will master it as well.
7: I have only used an Excal2, and can only vouch for it. It works well, and I am glad to have it. If you buy a new one, there is a good chance it will have some problems. All the new models seem to be defective, but, you could get lucky. Either way, it will be under warranty.
If you get an excal, most people like to purchase a straight shaft for it. The stock shaft is not balanced very well, and killed my hand. Once I had the new shaft, it was comfortable as heck. Also, a good scoop is not to be missed. Get a good one with a large basdket. It makes a HUGE difference. I personally use a Nuttall scoop, which while heavy, is very durable. My only regret is that the basket is not bigger.
If you want to ask me any other questions, it would be best to shoot me an email.
Anthony