I've got some friends with various Vex's, Marcums, Lowrances, Zercom etc. I sure love my Fl-12. While on Mille Lacs we had a lot of flashers going and mine functioned well while the others had problems with interference. Yes, we tried the reduction function and it worked great for me, not so much for them. The older Fl-8 models really didn't play well together. I don't have the zoom function, but don't seem to miss it too much. I know a guy with an fl 20 and he's had problems with interference and is happier with his Fl 12 in that regard. If you are alone it isn't a problem and the Fl-20 is sweet. Maybe he just has a touchy unit, I don't know. I think for the money the lower end Marcum with the zoom would be nice. I'm actually considering it as well to have for my kids/friends to use. I have seen the FL-12 propack II for under $300 with free shipping so that's hard to beat as well. The lowrance unit seems to last much longer on one battery charge if that makes a difference to you. Good luck.