I dove them in the FL a couple of weeks ago. Took them for a spin in Blue Grotto, and then took them about 1200 ft back in Ginnie while diving the Prism 2.
First impressions:
LIGHT
Comfortable
Love the spring strap
Not as much thrust as the F1 (obviously)
More stable (tracking) than they look... but again, not quite as stable as the F1
Overall I like them for travel, wetsuit diving etc. Keep in mind they are not trying to replace the F1- they are a different fin. That being said, I could see some people making the switch and going with the F2 for everything.
Anyone else been in the water with them yet? I, too, and curious to hear what other people think.