One of our MD club members swings her PI Pro like that. If you were watching her from a distance, you'd swear she was using a weed whacker. It's not as if she doesn't know how, she just prefers to do it that way (!!??). Anway, you can't argue with results, and hers are some of the best in the club. I think she still holds the record for the single most expensive diamond ring ever found by a club member (reported, anyway) - a nearly flawless 3 carat clunker. If that were her only find, you could say it's just a case of one lucky swing - but she does as well as the rest of us that keep our coils flat, level, and close to the ground (at least it seems that way). I think that maybe - just maybe - that arc in her swing causes the search field to extend a bit farther side to side at the end of her swing. Since it is a pulse machine, the varying distance between her coil and the ground doesn't seem to hurt the ground balance. One very nice thing about the PI machines is that they are VERY fast. Swinging one like you're cutting hay still picks up some pretty deep targets. That just isn't the case with VLF machines - your sweep speed is critical to your success there. Anyway, if the guy with the new Minelab buys a nice WOT coil he'll stop mowing grass with it - those things force ya to keep it slow and level or you'll be calling 911 for oxygen pretty quickly. lol