Well after some deliberation, I got the 3" x 18" coil for my Vaquero. Got to try it out in a park for about an hour today. BOY - can you really cover ground with that thing. Pinpointing is a snap, just off the tip or the toe, either one. A bit heavier than the stock coil but not bad. No real info on depth yet, but for open areas - ballfields, soccerfields, etc. - I sure do like it.