I have the x-20 and like it real well. I got the same deal last fall. Had the x-15ct before that. The pro is the bigger screen. I have it on a ram mount and can see it anywhere in my 17 Ft. boat. The con is less pixels. I can see a 3/8 oz Flexit spoon bouncing on the bottom in 100ft of water. I don’t need much more then that. I think the x-20 is being fazed out. The screens on both units are great. No problem seeing them in the sun. I just got the Navionics Premium chip today along with a Aquview. Hope to try them out tomorrow. I think you will be happy with either unit.