i didn't follow any of the testing instructions, but instead took a common use case from my experience with end users.
I copied and pasted content from :
1. A word document with lots of fun formatting
2. A web page (actually from moodle
The results were pretty bad no matter what editor i used.
None of the editors stripped ids, classes or style tags which meant i could very easily break the whole page and this made me sad
I know its often emphasized that user need education - to learn how to use the editor - but isn't it time as devs we started to learn from our users?