I'm intrigued! There's so much movement in the sandbox space. Can someone tell me how a V8 sandbox compares to say Fireworks or if they've chosen one over the o

I'm intrigued! There's so much movement in the sandbox space. Can someone tell me how a V8 sandbox compares to say Fireworks or if they've chosen one over the other? I think, from a technical standpoint, that it's neat that we already have an entire sandbox in the browser (albeit with a bit of chrome) but someone tell me why it shouldn't be used that way