I pretty much stopped using midi once realtracks came out. But the new midi supertracks really kicks midi up a few notches in my opinion, I've used the midi supertrack pianos on a few of my songs and they sound great.

I like them because unlike realtrack pianos I can choose the piano I want, acoustic, electric, etc. (I have a few decent piano VSTi's here).

It's great too because the person I work with also plays piano, so if she sends me a midi piano part, a solo perhaps, or a specific part to play during the bridge, etc., I can match that up with a midi supertrack, play them both through the same VSTi and it is seamless.

The midi supertracks are a great addition IMHO, and I hope PGMusic continues to add to the collection.