Looks like fun, and it certainly does capture the magic, but I'd echo Jerry and Frank regarding the obvious disregard for VFR Cloud Clearance requirements. Not a good example to set, particularly the partly-IMC aerobatics.

Also, CTAF calls should include the aircraft's tail number, although I can understand why your friend wouldn't want his registration audible in that video.

You might consider doing your buddy a favor and take the clip down before somebody with "Aviation Safety Inspector" after his name sees it. Even without the tail number, he wouldn't be hard to find; there probably aren't too many RV-8s based at that field.