Cue the AMSOIL hate..
Honestly, after watching that video, I must agree that AMSOIL definitely has something going for it. It appears, at least from the tests he did, to be very robust. I'm quite impressed that, even after the cooking it endured, it still flows better than virgin Royal Purple.
For me, the downside is still price. I just can't see spending $12 a quart, at least at this point in my life. I might consider it once I've used my current stash of oil and filters.. possibly.