Well, if I can afford I'd love to upgrade.
I am still using 3.3.
It's not that I'd need it for professional reasons, but I always found it to be useful to have a layout app like Quark on the HD.
What I cannot understand is the Quark bashing you'll find all over the internet. Okay, it took them like two years to finally release a MacOS X version of Quark, but I still think their products (well, they only have Quark, right!?
) are wonderful.