The one I have (first gen, more narrow than current iteration) is okay. Yes, protective, but VERY narrow.
Guitars are very close together and if you have something with an angled headstock like my LP it can be VERY nerve-wracking to decide if you want the headstock nearly touching the wall of the case or if you want the other guitar's headstock so close to it.
I made the mistake of putting 2 trem-equipped guitars in without removing the trem arms...ended up with a nasty gouge in the back of my Suhr. Argh!
Last thoughts: that narrow-ness means the entire case kinda flops over onto its side when I try to turn (change direction) while rolling it. Annoying, but not the end of the world. It also isn't square anywhere; it's an odd shape. Might matter when the case is being packed into a truck or the belly of a plane for travel?
I haven't flown with it, it's been in the back of various trucks, though.
Good luck to ya!