I'm actually still on my first ergo, a Lily58 (my first mechanical was a "regular" 75%). I was a bit on the fence between this and the Corne, and I think I would've been fine going with the Corne; I barely used the numrow and currently it's not even mapped, and I'm experimenting with putting the things I had left on the outer columns on layers or combos.
But regret... no, of course not. It's been a great learning experience so far!
I'll certainly build more boards at some point, at least a Corne because, well, gotta build a Corne, but maybe some other things as well. Maybe a Charybdis or a Cygnus or something like that.