I am not sure where Deer Mountain is, but my BHID300 works great on the beaches of NJ. It does have a big 12 inch coil, so using it inland can be a bear working around brush and such. It pin points very well due to the coil design.
If you want to compare it to an Excal, I have had both and I think they are both great units. I sold my Excal due to it being a lot heavier ( I had it on a straight shaft and even hip mounted it). This was not the Excal II, and the newer model is a little lighter. This is also due to me having some shoulder and elbow problems, so it's a personal choice.
As far as depth goes, do not compare the BHID300 in discrim mode to an Excal. I think most experienced BHID300 users, when beach hunting, hardly ever use the machine in discrim mode. We use it in all metal and ground balance twice...once using the standard way at the preset sensitivity setting, and then again it at the highest sensitivity settings without it being unstable. The machine ID's iron with a flash of red light so it's pretty easy to tell when there is an iron junk target under the coil. It can be swept MUCH faster than the Excal, and I think it is a little more sensitive to smaller gold than the Excal. The Excal has an advantage that it does not have to be ground balanced, but it nulls over iron in discriminate mode, and you have to sweep it really slow in iron laden areas to make sure the machine re-tunes itself so it can ID a target next to iron.
I have mine mounted on an Anderson shaft, and it's balanced great and swings a heck of alot easier than my previous Excal. It does go deep in all metal when the sensitivity is bumped up, and runs very smooth in both all metal and discrim. It has tone ID in discriminate mode, which is cool thing, but all metal is one tone and you have to watch the lights for the target ID.
But, if you are thinking about using the machine inland at least 30-40% of the time ( being it your primary detector) than an Excal II with the 8 inch coil may be a better machine. I believe the BHID300 is almost strictly a beach machine due to the larger coil and the ability to sweep pretty quickly. Not saying it can't be used on land, but there are much better options.
My 2 cents.
JC