solotripper wrote on Dec 21^st, 2012 at 8:41pm:

Kerry, From your post, I think that $8.95 thermometer would do everything you want IF your just looking for temp/depth. It would make a great stocking stuffer this X-Mas ;)

Maybe so, ST, maybe so. But this is my thinking.  Theory says that Lakers, big Small-mouth, big Walleye and big Pike all follow schools of bait-fish and, in the Summer, often suspend in open water at their preferred temperatures close to the thermocline. 
Finding that depth is one thing, but knowing that your bait is running there is actually the biggest problem when trolling.
The Fish Hawk unit performs multiple tasks.  First, it records the temperature at multiple depths in one pass.  No futzing around trying to find the thermocline etc.  Second, and as important, is that you can attach it to wire, lead-core or a Dipsy-Diver (presumably it would work just as well with snap weights or 3-way swivelsl) and it will show you exactly what depth your bait is running at.  Now that's a real bonus!
Don't get me wrong.  I'm not trying to convince anyone else on this.  Right now I'm busy working on myself.  If I do pick one of these up I'll let you know its worth next September.