I've looked at MiniMag conversions. I suppose part of why I haven't gone with them is I'm lazy. To be accurate, I deal with computers and electronics all day. That last thing I want to do at the end of the day is write code or dig out the soldiering iron. :P A lot of the conversions that I found last time I looked (it was a while ago) weren't drop in modules, but take apart the switch and play with it until it works modules.
Looks pretty drop in!!!
From Nite-Ize website