I'm a third of the way through and loving it to death.
Sure, it's not for everyone, sure, it's not something to sit through and watch in one go without a break, but it's an amazing kaleidoscope of just about everything we love, hate and take for granted about this Star Wars thing.
I'd say it's an important disc to have for a lot of fan-edit collectors.
It's certainly not the sort of bonus disc that Lucasfilm would put out but it does chronicle the cultural impact of the saga generally (and ROTS specifically) in a epic of the banal sort of way.
There's a lot of hard work and love in this project if you can get it and you get it, you will get a kick out of it.
+++UPDATE+++
Just got to the end and it's consistantly good, covers so much ground and is full of lovely little touches.
I don't think there has been anything quite like it before and it might be a long time, if ever, that anyone will attempt to do something like it again.