QuiltE, I'm a gadget girl but I still didn't want to have to buy another ruler but I found it made it very easy to trip out the blocks including those odd 3-patch blocks. I was confused with their instructions but finally figured it out. I now have the blocks put together to the next step but for whatever reason they came out .5" larger than they should so I'll go back to see where my mistake was. In this pattern, there is a lot of presisng open the seams instead of to one side.
But I still love this ruler but find it slides around so I added NexCare tape to the backside to keep it from slipping. I'm almost out of this tape so will need to pick some more up on my next grocery shopping date.