I'm on my third Mono bag now and I will say this to anybody with a new guitar above the 1K mark: Yes, Mono bags are worth the price.
I've had the first one for 10 years now which carries my ES175 and I can't tell you how many times it fell over, got a bumb, got thrown in a car and it survived everything!!!
Yes they are expensive, but they will protect your guitars against just about anything