I considered getting this foot when I started making some quilts with curved pieces. I watched several videos. Some use 700 pins, some use a special foot and some just use a couple pins. I decided to try the 3 pin technique:
https://www.youtube.com/watch?v=vULfFqqM3Uc
And found it very easy. I would do a couple of practice blocks and see how it goes before making the purchase. i really think that the biggest issue, however, is cutting accurately, either with a good acrylic template or die cutter.