Just as apples and oranges are both fruit, the Hot Shot and the EXcelerator are both coils. However, the Hot Shot coil is a concentric wound coil and the EXcelerators are DD coils. Marketing information aside, in a nut shell, which one works best for you may depend where you live and the mineralization of the ground you are hunting. If the mineralization is higher than 65-70, then you would fare better with the DD coils. They are designed to perform with less chatter than the concentric coils in highly mineralized soil. Another thing to consider is the shape of the detection pattern. Again, marketing aside, the DD coil penetrates straight down into the soil, taking full advantage of the diameter of the coil. A concentric coil has more of a funnel shaped penetration, creating the need to be more aware of overlapping your swaths. The soil I hunt here in the midwest is mineralized in the 50's and 60's. I always use a DD coil and have since owning several Minelabs. I have never hunted with my stock 9.5 inch Whites concentric that came on my MXT. I use only DD coils as I feel they are superior to the concentric in the manner and locations I hunt. Just my two cents worth. <img src="/metal/html/grin.gif" border=0 width=15 height=15 alt=":grin">