I'll be picking up a speed n temp unit here in the next couple weeks as well. From what I have seen on lou, they all seem to work pretty well. Everyone loves the one they have (besides the 840 ). I think I will probably be going with the sub troll as that is what a friend has. Also, I think I would be more apt to go with a coated cable. Yes it is not as convenient but I believe more reliable than signal. I was an electronics aviation specialist in the military. When you are sending a signal wirelessly, there is always the chance of running into interference in any of a million ways. I would feel more comfortable if that signal was just from the transom to the cabin than through 100' of water. Just a personal preference. Plus I have more than enough riggers for my use so I can run one just for the unit and probably save some wear n tear on the cable.