I had Dysport put in my "11" lines about a month ago.
While the onset was more gradual--to the point I got a bit worried--, I am overall more pleased with Dysport than I ever was w/ Botox. Botox had a tendency to over arch the outer edge of my brows, giving me a bit of a vulcan appearance. Dysport doesn't do that, and my brow isn't overly frozen, which I like.
Longevity of the product remains to be seen, but so far, I'd definitely do this again.