I think Illusto has potential, but it's still pretty buggy. For example, I've tried uploading several of my own music clips (.wav files) to my media, but if I click the "+" icon to add it to my timeline, it says, "Installing...". If I try to click and drag it onto the timeline, it shows it's there, along with the waves, but nothing plays when I click on the video playback.

The font library is pretty good, but you have to scroll the entire list to find what you're looking for instead of just having to type the first few letters into a search. For example, I use the font "Anton", and it took me a while to find it it.

Lastly, it seems to take forever for animations to load. I'm not sure if it's a one-time thing that needs to take place server-side, but it's pretty annoying waiting.

I think it's "okay" over all, but it is pretty buggy.