not sure they'll be great for super active stuff, the foot isn't stable in the soft, sock like design. that said, they look great, their comfortable. I really like them for more casual wear, and maybe lifting weights when I'm not planning to move around too much.
These shoes are not only incredibly light and comfortable, but provide a great fit to keep you locked down for whatever you're doing. Because the soles are so cushioned, I'd be careful when doing heavy leg lifts, but they're a fantastic all-around gym shoe whether your training, running, or just walking around.