I've almost used these in projects many times when I wanted to add basic animations quickly. Credits to the authors for making a library with a nice CSS API, good docs, and a nice demo website.

... but I've always found the defaults too loud for my taste. Kind of like most Power Point animations --- only usable now to be satirical or intentionally corny. That, and the provided animation flavors are never quite what I want. Once I consider considering customizing them, I decide to just go with something else.