I have the White's Dualfield. Surf Master has those pretty lights right?
Both PI from what I understand, which in my opinion means:
You'll be digging everything that beeps - from bottlecaps to chain link fence to nails, screws, rivets, cast iron pipe 4ft below the sand
Don't get me wrong they are great machines and I think have better depth than some others, but they are a workout if you have a virgin area or a place with a lot of trash. If you're in a place where plenty of guys cherry pick or there is high mineralization then you'd probably do well.
Edit: Are you really in Israel? Nice beaches and probably some nice erhhmm scenery but would really need to be on the up and up about rules for MD to swing there.