I'd been thinking about buying this pedal for a while before actually pulling the trigger on it and boy, I'm glad I did so! This thing is a beast, it handled everything I threw at it, and masterfully so.
I use it with the clean channel of my BOSS Katana 50. It sounds like a tube amp, very organic and defined. When the aggression switch is off, the gain is lower and somehow blends with the clean tone of the amp. The blue mode is heavier, but very tight and articulate, perfect for djent-style stuff or heavier rock. The red mode is the one I use most. It is a bit scooped, enough to give it a killer metal tone, the setting feels overall 'looser' but every note still rings clearly.
I downside would be that it's a slidy pedal, and the back scratches easily when doing so. I would have liked a rubber casing of some sort included, but this is not a deal breaker.
One of my best guitar related purchases!