Hey grafta, I have the SA vids plus I took a private lesson near the beginning of my season 2. First off, the SA vids are more for park stuff, whereas the lesson was for downhilling. The lesson was more expensive (duh!). But the instructor pointed out to me certain things that I specifically was doing wrong, and helped a bunch. If the costs were equivalent I'd def say you get more bang from a private lesson (those with dirty minds should just holster them right now
). I'm quite happy to have paid for both, and I'm planning on taking another lesson this January or thereabouts.
Edit: Having said all that, I progress the most when I step outside my comfort zone, and especially when I have a specific goal.