I did. They had one at Guitar Center for about $2400. Someone actually bought it. It blows the Katana away. There is something really cool about it, but it doesn't take more than 10-15 minutes to feel like you're playing through a solid state amp. Short of having the tube magic, it has everything else and then some. I did't mess around with anything except basic clean and dirty sounds. The cleans were less frustrating than the Katana, and the drive sounds were just better overall. It has a less hollow solid state feel than the Katana. It has kind of a tube emulation thing going on in the tone that I can't really describe with any articulation, but it's something that kind of gives it a little more organic quality than the Katana. It's very punchy and gets VERY loud. If I ever came across one for $400-500, I'd buy it.
The Katana is very impressive (for the price) for the first day or two, but it loses its appeal once you plug into a tube amp. That's my honest personal opinion about it even though I think it's a great amp because it offers a LOT for the money and has some outstanding effects options. Compared to the Katana, the WAZA brings a lot more to the table. Whether it brings $2000 more, I doubt, but it's substantially better in my opinion. I spent 20 minutes with the WAZA, but I spent a few weeks with the Katana, and I came to this conclusion based on that. I think the WAZA is pretty cool, but it sounds better in person than it sounds in most videos.