I don't use GoBack anymore. I used to for a long time, though. I loved it. It's great when you make constant changes to your system. System Restore doesn't completely restore everything; GoBack does.
There are a few drawbacks to it. It tends to interfere with some programs. (or else some programs interfere with it...depends how you look at it). It made defragging for me slow to a crawl. But in a pinch, it's great to have.
I like using Drive Image 2002 now. But if I didn't, I would use GoBack, simply because I'm always changing something or other, and System Restore just doesn't get it.