I have been a WOT user for several years, on both the Explorer and Sovereign, and think it is a great coil. PLUSES- it is able to get a more positive solid ID on older, deeper coins. As Cody and others have pointed out repeatedly, most detectors can achieve about the same depths- the difference lies in how well they can ID the deeper or "iffier" signals. The WOT finds a surprising amount of coins that are NOT all that deep- say 6", sometimes less, in areas that have been scoured with standard Explorer coils and other good detectors. The signals and ID's on these are sharp and clear enough that you would definitely dig them- but how were they missed with other detectors? My guess is they are either tilted or near a small piece of junk, and that is able to throw off the ID enough on other coils that you would not dig the signal. And of course it does ID DEEP coins- 10", sometimes more- in moderately mineralized soils. Again, these coins may have been reached by standard coils, but the ID on them has probably shifted so far toward iron that you would likely pass them by. This is particularly true of silver- the WOT is HOT on deep silver dimes. Last Fall, before freeze-up, I had worked an old Chicago park area that had produced scads of old coins (Barbers, Indians, occasional Seated) in the past but had become really tough to find more than 1 or 2 old Wheaties in an hour of hard hunting, and maybe 1 piece of silver and a few Indians by the end of the day. However, a dry summer hasd really wiped out the grass so the coil was right down to the ground. I went over the area with the stock Explorer coil and did pretty well- don't remember, but something like 6 or 7 Indians, 10 or 12 older Wheats, a few old Mercs/worn Barber dimes, in a 6 hours hunting day. Came back a week later with the WOT coil on, redid same area for kicks, and was surprised to come up with 7 or 8 silvers- 1 old Seated dime, 4 Barbers, 3 Mercs, and maybe 15 mixed wheats and INdians. Area had some junk, but not too bad. Oh, I had also done it previously with the 5" coil with rotten results- only a few 1940's and 50's wheaties. However, I have gone over other "hunted out" areas with the WOT and found little more, so it isn't always a "magic wand". Maybe some areas really ARE hunted out. It requires no unusual adjustments- you can pretty well use the same sensitivity and settings you have been using with the stock coils. The WOT can handle surprisingly junky areas, more so than you would expect, but you have to accept a lot of signals bombarding you. Of course it is best in older areas where signals are many inches apart. Pinpointing on it works like the stock coil- I use the front edge, backing gradually away from the signal until it dispapears, then edging slowly back toward it until the first sounds come thru and it is right under the foremost leading edge of the coil. Since this is a double "D" coil, it is hot all along the 15" center bar. It will pick up the digger you have in your hand while walking along, so keep any large metal object several feet away from it.
Another nice use for the WOT is beach hunting if you are into that- the size of the coil allows for rapid coverage of acres and acres of sand. The WOT coil on the Sovereign makes a great water detector, but you are limited that way with the Explorer as you can't take the "box" off the shaft and hang it around your neck.
DISADVANTAGES- It is EXPENSIVE. It is LARGE. It is HEAVY. Because of its size and weight, it tends to easily flop or slowly collapse at the attachment bolt on the coil when you set it down to dig. (There are cures for that with a triangular plastic spacer/wedge). If you tighten it too much to stop this you can easily strip the plastic bolt. The weight problem is helped immensly by using a support strap- a "swingy-thing", or I simply use a long strong bungee cord (6' I think) that goes around my neck with one end hooked around where the two stems join halfway down to the coil. The other end goes around my neck and attaches with its hook end thru the hole in a simple overhand knot I tie in the cord at chest height- this knot is easily moved by retying for an adjustment so it is swinging at the height you want. Cheap, and easy. And of course its size makes it really clumsy to use while kneeling down to check the dirt pile, so the Sunray X-1 probe is almost a necessity- but it is a necessity with any coil I feel. Best invention ever.
I can't comment on other coils named after primitive Australian animals as I have never tried them. Hope this helps a bit.
