I had a GO! and quite a few dies. Unfortunately, as I don't have a lot of room, I could not leave it set up and ready to use. Thus, it rarely got used, but took up valuable storage space. I sold it, and all dies, at a huge loss.
The only thing I ever found annoying about cutting, when I did use it, was static build up - which means that the pieces cut stick to the mat that is lifted away, rather than staying flat and lying as they were cut. If you've layered fabrics so that you can just sew them together, they are no longer in that order. If you wanted to rotate and sub-cut, you had to re-layer them.
My favorite dies were the HST's (anything up to 3", I don't use larger ones) and the small tumbler, which I think was 3.5" tall. LOVED having no dog ears. Oh, also the custom FQ die that cut a variety of strips and squares from 1.5" to 2.5".
I don't have any problem cutting strips, so strip dies were of no value to me for the cost. I use the large Stripology for fast and efficient cutting of strips. Next to no storage space and multiple, accurate cuts.
Now, many years later, I am starting to have more shoulder pain and arthritis in my hands. Perhaps someday, I will invest in another, but it would be the electric one. Definitely pricey, but if it enables me to do what I enjoy without pain, and if I can figure out someplace to keep it, it'd be worth it. It's still the place to put it that is a problem, of course. I don't buy much fabric anymore, so what I used to spend in fabric, I could shift to the cutter and dies. In the meantime, I try to plan ahead better so as to not need to cut a lot at a time. An hour is doable, so I do that, then move on to something else until the next day.