I had a LX-7 when it first came out, I sold it last year for a FLX-28. The marcum is great when it’s working but I needed something more reliable. Below are my pro’s and con’s
Lx7 – Ability to change views (sonar to chart), get free software updates, big screen, ability to view whole water column and zoom entire water column. Heavy, sometimes dynamic mode picks up to much interference, LCD screen (colors not as rich).
Flx28 – LED lights, simple buttons, light, reliable, doesn’t interfer when next to another vex or marcum, QUIET.
Doesn’t have zoom at any water columns, paying for basically a fl-20 but LED version.
Overall, you can’t go wrong with either. I’ve experienced great customer service at both companies, reason why I didn’t go with Humminbird because they are out of state.