I loved it...and I think playing with MIDI files is underrated for complex pieces.
After all you can only do so musch with style play and a fixed function style.
A multi-sequecnced MIDI opens up the world to you.
Remember we don'y all play out in front of growds where we would need to be 'flexible' on our playing...
A Orchestra performance is usually played 'byu the book'
I plan to use a lot of MIDI when I get my new arranger.