If you get it, be sure to post your experience with it, as I'm considering joining too. I just think right now I'm too much of a novice to benefit as much as if I wait to get a better grasp on the basics.
As for my opinion on whether or not you should get it, I think having a teacher helps a ton learning anything based on my experiences trying to teach my self things
So yeah, without any experience with the site, I still think lessons would be a huge benefit to you.
I don't know if the option to download their videos is built into the site, but you can get free video downloaders on the net. Internet Download Manager has a 30 day free trial.