I have the X-100, and it's pretty much a monster (heavy but deep). I noticed, on the chart, that the ML PI wasn't getting the greatest depth.. hmmm. One thing I've noticed about the X-100, and probably other Compass detectors, is the excellent disc. It's almost unreal how well it does amongst iron trash. It's too bad that Compass has about gone belly-up; I'd love to see a new & improved version of the X-100/200.. lighter, more ergonomic, and with modern electronics. ..Willy.