I have one! I'd say it really depends a lot on the type of quilts you want to make.
It is absolutely wonderful for triangles (nips off those corners, making perfect lineups easy), odd shapes (tumbler, octagons, circles) and fusible applique (Sunbonnet Sue, etc.).
For log cabin and other strip quilts, I personally prefer the June Tailor Shape Cut mat. It is actually easier for me to use for strip cutting than the Go is. If you cannot cut straight strips using the June Tailor mat, then the Go can be a godsend.
I find that I am not using mine as much as I thought I would, primarily because I am currently more interested in piecing strip type quilts and doing freezer paper applique (turned under edges). I do like the Go, however, as it stores very conveniently. The dies are less convenient to store, but still not bad.
Be aware that the cost will not stop at $183. You will want at least a couple of dies and mats to make the cutter really useful. Sometimes the hardest part is deciding on exactly which dies you want right away.