*coughs* sorry, pardon the brief flight of fancy there...
If half of what one hears on the road is true your average Gulfstream does seem to be more reliable than the older GLEX. I am currently on an old one and it certainly keeps us on our toes. The newer ones are much improved and probably on a par with Gulfstream, however the back-up provided by Bombardier is not always the best and I suspect that that's one of the issues referred to in the above pro-G4 post. Have to concur there.
I do know of an owner who turned down a Gulfstream for a GLEX, purely for the bigger cabin!
An ACJ, now I'm sure that's comfort!
