It is "almost" unusable. It does do a better job on some things, particularly humans. Could just be me. I have a 16 core cpu, and a fast gpu, which I thought would be enough. Nope. I found that if you set large buckets for memory, even if you have lots of memory, Superfly will just blink out. It stops to a blank render screen. But, i was doing it wrong which I found out thanks to Boni. 64 is suggested bucket size and then it works fine, just takes several lifetimes. Even in the video the narrator suggests that if you set things up on high settings, the render will not finish in your lifetime, and he is using a Xeon Cpu, which should be quick...er. Thanks everyone!