couplers are a non-event in a good way -- can't tell they're there, never notice them or even think about them really, just lube 'em w/ teflon bearing grease every once in a while (it helps to cover the downtube one as in the picture) -- and once torqued they don't loosen.. i've only ever used the softcase on airplanes with no problems .. just fill in the empty space with clothes. i will say this, tho, fenders and that disc brake are a pita and a campy ultra-torque crank would be great for the bottom bracket (mine's square.. i worry about constantly removing and attaching the cranks and ultra-torque is just quicker). it took me around 2-3 hours the first time to figure out the best way for it to all fit together (it's a big bike and a tight fit -- probably the hard case would've been worse). be sure to take photos and document the procedure for you and the tsa guy who rips it apart (thank god this has never happened to me, but i live in fear of this)... all in all there's really no downside to it other than weight and the occasional maintenance.