I love my GoBig--bought it during their sale after Thanksgiving ($50 off) and bought the strip set, then bought the triangle in the square in 2 sizes (I always mess that up trying to rotary cut!) and the log cabin--all on sale. I plan on getting a Qube next summer at the KC Regional Quilt Fest but still debating which size seems most practical to me. I can cut soooo much more accurately and it's amazingly fast!
I have a Shillouete Cameo that I got for appliques(but have to use fusible and only layer at a time) and for cardstock and vinyls--works great for that but doesn't hold a candle to using the Go for fabrics. I got the GoBig cause I realized I really needed to be more accurate plus was having shoulder pain when cutting and standing to cut a whole quilt left my knees super sore--well worth it.