I had an "old-style" WOT hard wired to my excalibur II for a few years, then it went bad. I ordered a new WOT (spring 2015) and when I tested it the noise was erratic---still looking into this. I had a beach trip coming so I panicked and bought a brand new excalibur and a brand new WOT (I know that I voided the warranty doing this). I had excalibur Dave hard wire this new WOT to my new machine. While at the beach I can only hunt at sens 2 ---above that the chatter is deafening. If I lay the coil on wet sand at sens 1---the chatter is the same. I can hunt if I leave it at 2 and do not touch the sand at all. If I bump the sand the machine goes crazy----kind of like the coil is too sensitive. I could run the sens at 8 with the old style WOT with no issues. I have heard others have the same issue. Love the WOT but will switch to a NEL if need be. Any comments welcome. Thanks, Joel