I dislike the Shuttle boarding process. While upgrades are generally pretty easy to get, if you ever need to switch to another flight after all V inventory is gone, you are stuck in the back. Thats fine, but I can't do middle seats, which ends up being the only thing left if you don't show up early to board.
Even though its only a 30 minute flight, there are usually ground delays/stops/holds at LGA that often elongate time on the aircraft. I'm 6'7", so 1+ hours in a middle regular coach seat is torture. I'd much prefer regular seating/guaranteed exit row if F upgrade doesn't clear.