Fish Hawk (new X4). here is what I have read and heard from guys that have used it: No coated cable, don't have to take original cable off of riggers, reads to 300', can be used on any rigger in the boat, smaller probe, epoxy coated internal electronics, runs all season on 4 AA batteries. I just purchased the new probe to use with my 840 unit. If the new probe was not compatable with my old unit and the new X4 did not come out, I would go with the Depth Raider.