I don't use it for mixing, but do use it a lot to clean up audio for podcasts, from performances, etc.

I like it a lot, but it does take a machine with some horsepower to really use it to its fullest.

The machine I currently have it running on is an AMD 8 core "Bulldozer" CPU, 32GB 13200 RAM, 256GB SSD. This configuration runs it just fine.