I used it a ton levelling up, even keeping my MR up for it before I was immune. I liked to stun->ae mez to reset after a charm break solo. Also nice to lock down a pull quickly in an xp group, but it's a bummer that it is likely to blur the mob your group is killing if you can't exclude it from the ae area.
Lately though I find myself memming it less and relying on color slant+skew more heavily instead. That may be in part because I haven't done a lot of soloing against mezzable targets lately, though. You have the option to slant then memorize ae mez, but if things are going smooth enough I tend to just recharm on the stun.
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