The 11" DD standard coil on the Simplex + is fine for a beach, for hunting plowed fields and pasture, or for a wide-open grassy park. But ....
We need at least two smaller-size coils. we've heard they can't make a Concentric coil work, which doesn't make a lot of sense to me, but if all we can have are DD coils, then PLEASE give me two of them:
An absolute need is a 5" DD to hunt the trashier sites. The really challenging, nail infested, dense debris ghost towns and homesteads and all manner of places with building rubble. Something small enough to work in close to and around metal structures in playgrounds or fences, etc.
And a good, universal 5X9½ DD open-frame mid-size coil to tackle all the hunt needs not handed by a 5" or 11" DD coil It's a really nice size for low to moderately litter sites yet still provide a bit better coverage and detection depth.
I've needed both sizes for the seven months I've had a Simplex + on-hand and really need the 5" DD more in about a month when weeds burn off of some of the old gold mining townsites and we can get back to hunting. Patiently .... very patiently waiting for a couple of smaller coils. My two Simplex's are also at-the-ready. Coils are needed!!!
Monte