I was using the 5x10 DD today, GB @ 24, Sens at max 30, Pattern 1, and was hitting dimes at 7-8"measured inches, with good strong audio and locked on ID's. (clad) -- I was a bit surprised by the depth, but had not run the 5x10 @ max power before. Ground was pretty clean, no real problems with falsing. The HF coils seem to work well for me. Reliable ID's, (though it seems to read about 2 ID#'s higher than the other coils on like targets), easy to rule out the iron falsing with the AM trick, and much less chatter/noise than the 7.5 or 3 kHz coils at the hi power settings. I really like the super light weight of it also. Don't know why, but I just don't seem to get the performance from the 6"DD????? -- Though many claim the HF's are noisy, They seem good for my soil. Only dislike was that I dug some very deep and very small pieces of can slaw that ID'ed as coins, ...........though if I went into the Prospect Mode, and "sized" the target, it helped to prevent deep digs for aluminum. --- No rocket science here, just thought I'd pass it along..........