Not too bad. I've been using NicEdit and am reasonably happy although not married to it. Despite the plethora of options, I still haven't one that doesn't suck in some way. TinyMCE is way too bloated and outdated. CKeditor is also bloated and the new design is horrific.
Regarding yours: * don't like the gray background * need tool tips * textarea needs to be resizable * i don't love the slide-in effect * i assume it's configurable which buttons show? As far as integration, it shouldn't need to be too tight. Should simply be able to assign it to a <textarea> and everything works as usual. It's a nice exercise but unless you are in it for the long term, I'm not sure I would switch to it.
