I have been thinking about getting the Hummingbird 140 for my toon, but figured I would throw the question out. Who uses these? Are you using them mostly for depth/contour or actually to locate fish as well? Is the side finder option worth it? The few guys I have talked to seem to mostly use these to fish chiros deep for finding exact depth and stick it 6-12 inches off the bottom. Any ideas/thoughts are greatly appreciated.