I do almost 100% styles. I use a few midi files, but I'm perfectly comfortable without them, and sometimes go all week without using one.
I use a midi file on Suspicious Minds, Wooly Bully, and a few Sinatra songs when I don't feel like playing them.
I also have the themes from a bunch of old tv shows that I sometimes play "name that show" with, maybe a couple times a year!
DonM