I'm pretty sure the only difference between the two versions is the amount of questions each has. The 2008 has more naturally =), but is it worth it??? I would say no... it's way to expensive.
The 2008 version probably has like 100+ more questions for each section. If you can afford it then you might as well get it, otherwise you have to make do. I loved destroyer so for me it would definitely be worth it. Everyone has different opinions though.