Let start by saying Hi! I'm so new to this...the sun has not risen on my Ace 250 yet. I have watched the DVD, read the manual, and picked up alot of un-seen roofing nails from the yard. I received the detector as a B-day gift..( which I asked for...) and will be heading to the coast in 3 days. In the model comparison, it shows the Ace 250 not in the running for surf/beach hunting. what can I expect?