It's better than nothing (I've been using it for a while), but it has trouble handling confirmation dialogs unless you keep the browser window in the foreground. Also it seems to miss quite a lot of posts.

It would really be so much better if Facebook was forced to implement batch delete in their API and/or in their UI.

I've had to uncheck "Preview" and set it to 0.25x speed for best results. And a second pass at anything it didn't cover (which isn't much at that slow speed). Works OK, although it takes forever either way. Just slightly less, ironically, by making the script takes its time.

The tagging and likes are a more manual effort.