I finally bought one because, in my old age(!), I'm finding it hard to cut correctly. It's really a dream to use. The dies are expensive, so if that's an issue you need to think about which ones you'd use the most. My biggest cutting problem is strips, so I definitely have those dies. But I did go kind of crazy and start to hoard a lot of the other dies too.
My last couple quilts were made with pieces where I couldn't use the GO. So it doesn't cover every size or shape! Bummer.