No I'm sorry I've never shot with one. From what I read it sounds like it would be a nice addition for competition, provided it's allowed in the class you shoot.
If you've never taken the trigger system apart on you M&P before here's a link to the armorer's manual, just scroll down to find it.
page7b
It can be a little tricky lining up all the holes to put the trigger headed pin back in but I believe the AEK comes with a slave pin to help out with that. Check their videos too. It's not hard but if you've never done it, it can take a few tries.
Maybe you could take some pics and give a range report when you're done. I know I'd be interested.
Dave