The weirdest thing about the Advantage is the hollow echo sound it makes. I'm using a $300+ keyboard but it sounds so cheap due to the hollow sound. It seems so obvious after first typing on it.
Besides that, it's an excellent keyboard and I'll never, ever buy a regular keyboard again. Everything else about the design makes sense, and it's completely programmable.
Couldn’t stand the small rubber nub function keys, and the as you mentioned the echo was off-putting. Also zero customizability in the split nature since it’s one massive plastic hunk…. Excited for the advantage 360 this summer as they finally are addressing this by going split and ditching the function keys
I replaced the controller[0] in mine and moved the f-keys to a separate QMK layer so I didn't have to use the tiny rubber keys anymore.