The dactyl keyboard family with built in trackballs are way nicer than ones with built in track pads at least from my experience. My personal favorite so far has been a Charybdis from bastardkeyboards. Expensive but I don't need a mouse anymore for being productive.

Hah, 2 minutes before my remark. I feel like if anyone has 2+ ergomech keyboards, they should really try something with a pointing device. It's clear they don't mind having an expensive hobby :D

That looks really nice! I haven't spent much time with split keyboards, particularly the extreme ergo things like that but I am very tempted!