I don't know how I would understand anything in Eco without Leading Edge.... I go to the workshops and do correspondance tudoring though them.. The revision workshops are definately worth it but don't bother with the Exam Strategy Workshops... I could have found much better ways to spend my two days in Sydney then at those...
However in saying that the workshops are only useful if you already have a fairly sound understanding of the topic already, and if you can sit for 1/2 a day listening to economic jargon and lame jokes...
It can be an eye opener though...
I travel to Sydney to go and it blows my mind how well some people can understand eco. like I'm top of my year but compared to some of those that are their I look like I know nothing...
It is really a personal choice... But I have really benefited from it...