These are really great. I have one that I need to get a teensy for. For some reason they feel much faster than the Model M to me. I think I'm just going to get used to the odd layout and remap as best as possible.
I started the quest to find a good mechanical keyboard to find something that I like as much as the model F, and I can't, so it looks like I'm hooked.
So far I've tried MX blue, brown, and black, a model M, and black alps (an old Dell AT101w). Strangely, between each of those, I actually like the MX blacks behind the F even though the switches are totally different (maybe that's the reason - it feels like its own thing, and I like the smooth resistance of the linear switches).