Cool! I've got the Satriani Crush of Love/Power Cosmic, Vai Amazing Grace and a Greg Howe flexi from the late 80s. One that I really liked was from an issue of Guitar player where they published songs from readers of the magazine. One was a guy playing ragtime and country style jazz on a nylon string and the other was a chap playing really crazy jazz fusion, I think the track was called Spak (and the name James Blackthorn also sticks in my head for some reason).
Flexis were great.