Coworker of mine had one and loves it. I have a mark 5 currently and i need a gps/ff combo. The mark5 is a darn good budget unit which came with my boat.

As with most electronics, the first thing you need to do is get off the factory settings and dialed in where you fish.The factory settings are ok, but you open up a whole other world once you are set up properly. Currently I can tell between bait, fish, hard bottom, soft bottom, etc at a quick glance. My gps died so i need one, figure kill 2 birds with one stone in a small unit.