i was at fleet farm playing around with some of the ones they have there. the lowrance x4 is the same as the eagle cuda 300. same buttons, everything. just different color/name on them. i read a ton of reviews on the x4 and x4 pro. seems like the x4 is better than the pro version, but i havent gotten around to looking into eagle cuda 300 reviews. i like the idea of the silicone puck and keeping everything internal, although knowing the water temp wouldnt hurt.