Just so happens that I built my Ergodox over the Thanksgiving weekend. Couldn't wait for the custom keycaps to arrive, so I ripped the caps off my poor Das Keyboard and started using it. The Gateron switches feel and sound better than the Cherry ones on the Das actually.
As for portability, I think it can be done if I can do something about efficiently housing the cables (the TRRS and the mini USB). With some creative use of hinges to hold the left and right together and perhaps fold the two, it is about the size of a small book. Of course, doing away with the cables altogether by getting some sort of wireless thing going will make it even easier to manage.
Every time I use it, my mind races with possibilities to tweak it. I've already tried tenting it with foam padding under each and using long ass M3 screws. Funny thing is that tenting is more comfortable and is ergonomically sound, but it takes some getting used to. Same with the matrix layout of the keys (versus the staggered one on regular keyboards) - I keep missing the 'c', 'x', and 'z' keys.
Using layers, however,I was able to replace the shift lock key with a toggle key that kinda acts like a control key - something my muscle memory still remembers from the school days when I worked on the old Sun workstations. But rather than a control key, it's a layer toggle that lets me access another layer that has a bunch of vim keybindings. Effectively, this allows me to vim-ify any editor, even use word processor as if I were using vim. It feels so great to be free from the vim key jail I was in. That alone is worth the $200 admission.
On top of all that, the keyboard feels fantastic! Better than any mechanical keyboard I've ever tried. Once I get back to my normal speed, I have another layer with colemak (just one keypress away) that I'm gonna try to learn.
Typed on an Ergodox...