I have a 15" Folded Horn cabinet (Music Man RH115) that I've used with my practice set up frequently with great results.

I haven't gigged with it yet because I'll have to get a speaker with a higher power rating.

I'm really just wondering if it is worth it, I mean, has anyone had good experiences with a large folded horn under a single 15" speaker for guitar when gigging?

As I understand, it will sound weak on stage and louder than hell 30 feet into the crowd.