I have heard them. They sound great, as most Yamaha gear does, but they are quite heavy.
I "a-b" tested them besides Peavey's powered speakers, though, and I though the Peaveys sounded better. And they are made in Meridian, MS. USA.! Oh, and the Peaveys are very heavy too.
In my opinion the Peaveys were right up there with the Mackies as far as sounding great.
I've only heard the Peaveys, Mackies, Yamahas and JBL EONS. And that's about the order I would rate them on sound alone. The EONS are lighter and easier to carry and they do sound good. They are the only ones I've owned.
DonM