I've used Quotes Collection, but Stray Quotes seemed much better so I've shifted. Part of the attraction is that SQ had built-in AJAX auto-rotate.
However, because for QC it wasn't built-in, I added my own JS to do the trick, and got it working how I wanted: quote fades out, load new quote, quote fades in.
In SQ, I've set the "loading" text to blank to get rid of it, but I'm not sure of the best way to make the quote fade out then back in. Obviously I can just go in and hack the JS, but is there a better way to alter this without changing plugin files?