I bought the lx7 the first week it was available. I like the unit, but always thought it was too clunky – it’s kinda like fishing with ET; I was frequently concerned with getting that awkward lil’ guy bundled up and home safely. I got the flx28 as a hole hopper right away. That has been super for any kind of fishing. I finally traded my lx7 for a lx6s, the smaller format is much less clunky IMO. It’s been working into the rotation more frequently than its bigger cousin did.
If you’re a crappie angler and like to fish at night, I’d seriously consider the flx28. It’s a device based on simple signal fidelity and reads the entire water column in a simple and straightforward way. If you’re a walleye guy, anything will work.