I play BFG, and it's FAR more simplified than SFB (cruisers have either 6 or 8 hit points, escorts only have 1, no shield arcs, hardly any range-dependant shooting or damage - the weapon batteries use a gunnery table depending on what way the enemy ship is facing, with column shifts for stuff like blast markers, being at a certain range, ehe effects of a holofield etc - and VERY different movement and tactics depending on your fleet (Imperials, Tau - whose resin ships from Forgeworld look a lot like the ISC ships in SFC2 - etc move like sailing ships, Eldar ships have a double move and can turn on a pin, Necron ships can manouvre at high speeds and generally scare the heebie-jeebies out of their opponents and so forth) but it's also FAR less trouble to play a fleet engagement with the rules and unlike SFB or F&E I have had harrdly any problem finding opponents.
I'd love to see the BFG game engine as a basis for Star Fleet Action, but SPecialist Games and ADB could end up being rather too jealous of each other's systems too let that happen...
Oh, and I have F&E (and will get ISC war) and have yet to play either it or SFB against anyone (I have seen very few converts to the game my age - I'm 24 - and nobody in Ireland seems to take ADB or TOS stuff seriously at all, hell even I would rather have the movie-era ships in a tabletop game than the TOS stuff, I think the old designs aren't so great but that's more of a personal taste thing)
Gary