Ok.. I've just got started on the free deal. My experience so far is positive with a few small quibbles.

Pros :
I like the video player, works great on the mac. The A-B repeat is very nice. Being able to download the clip is fantastic (I travel frequently) but as they are FLV, I am likely to want a local player for those features (on the Mac, naturally). Even a downloadable html page could work.

It looks like navigation will easy on the website.

MP3 format for audio only lessons is great.

Cons :
Looks like a significant portion of the lessons are MP3 and not video, I could be wrong.

Downloaded file names for FLV and tab have no obvious relation to each other and little relation to the lesson. Again, I travel a lot and will be offline often and will want to be able to practice.

It looks like there is no mechanism for determining which lessons I have already 'completed' that might be nice.

Some of the lessons seem a little thin.. how to play a C9 chord. I realize that this was a beginner lesson, but that was awfully short.

Overall, I'm pleased so far and am likely to try it for a while at least.