I can tell you first hand that an plain old ordinary Fender Strat is no big deal to carry around. The gig bag's shoulder strap works really well. You can buy one for $100 on Craigslist so you don't even have to worry about it getting banged up or lost. And it's hard to damage being made of solid wood.

My wife's flute case is even smaller and easier to carry.

Hey, I was misundestood! I mean a 40 kg piece + case and stand are not that difficult if one travels by car as I do. My worry is only about the inside materials, that for previous models were proven not resistant. I would not write jokes to this list like taking a real piano aboard (though Richter himself dreamt about having a truck to load the piano and travel along villages to play in the church!!!)
The feeling of Roland's PHA is splendid, but what about inside construction???

rgds
antonis