The other advantage to the upgrade is if you didn't upgrade Form from the Trapcode Suite 10, you would have had to pay an additional 100 dollars to upgrade just Form. This gives you the entire upgrade path for a hundred bucks, plus MIR. I just installed the suite last night, so I haven't had time to play with MIR much, but what I have done did a really quick render on a mid-level machine.
The upgrade also includes two very nice sets of Particular and Shine presets, which have some very nice jumping off points for custom effects. As I say, I'm not in this for anything but to save some money for other users.