You get a dual beam transducer with the Marcum and a not so well liked preview on the Vexilar. Watch videos on utube of all the ones you think you are interested in. Dedicated ice units have buttons and knobs right up front to make needed adjustments. Boat or so called universal units will require digging into sub menus for things like gain / contrast/ IR / back light and such. This can be very frustrating. I use a LX7 and a LX5 that I bought used many years ago and have not had a problem with either one. I use them on the ice and dock fishing.