First year or so I never used one. Then I bought a Vibra-Probe off of evilbay. Never go out with out it now. As others said it's water proof and has no switches to break. I think people think when you get a pinpointer that they are a no brainer to opperate. They do take a little patience to figure out, but once you do your golden.............
I use the BullsEye too, and it works great. It saves at LEAST half the time than working without it.
Sometimes on a shallow coin, you don't even have to dig - just press the probe against the ground, and if it's not too deep you find it instantly.