Welcome from Michigan.
i have the large Accucut Studio, but also use the Accucut GO! dies. My opinion is that there are 3 things that make a block accurate: Cutting, sewing and pressing. Anything that helps with these is worth it. If your cut is right on, your piecing is off to a good start. It is an investment, however. If you do lots of geometric quilts, the strip cutters are great. they also have lots of applique shapes, but you need to decide how much you would use a specific design. Note that your 40% off coupons are normally not applicable to the accucut cutter or dies at Jo-ann's. Check on line, you can often get a great deal. And finally, if you do a search on this board for Accucut GO, you will get lots of info.