I didn't see any real transitions. I think I might have seen a bit of fade-in after page load, but that might just be a browser quirk. If the fade is why you're talking about, that can be easily accomplished with just a few lines of CSS; no framework needed.

If there's some transition I didn't see because of the browsers I used (I tried two different browsers on two different devices), then it might be worth using the framework, but I maintain that I haven't seen the demo site show anything that couldn't be done with vanilla HTML and CSS.