I bought a slightly used AT pro recently, and it has worked great for me. I really like using it, and it really isn't that difficult to figure out. However, I do want to buy a new one at some point, and just have the used one for a back up. That being said, I have been watching some youtube videos about the ACE 400 which appears to be just as good as the pro. I don't really need a machine that is water proof. Just the coil being water proof is good enough for where I hunt. Knowing this information, should I invest in a new ATP or go with the ACE 400 and save a few $?