I'm in the first class in 106 that started picking E's or F's before classing up. Can't say yet if it was/wasn't the best of ideas, because I'm still in Fams. Also, our curriculum is being wrote as we go through the flights, so on some flights you have no idea if you're going to fly as an E guy or F guy that day until brief. I'm sure it'll work itself out in the end, and hopefully the F guys will be more experienced with working as a crew vice how they were previously doing it.
From my class, 7 out of 8 initially wanted F's (no reason, we never flew in a Hornet, nor with a WIZZO, so who knows what we would like). There turned out to be 4 E's and 4 F's, and the way they split it up was by NSS out of advanced, (Top guy gets his choice, bottom guy got his choice, etc.) just to make it even.
BTW, just did my "crewed" solo....freakin awesome