Don't want to offend anyone but why whenever someone brings out a new tool does everyone think they need it. I'm still using the seam ripper that came with my original sewing machine my mum bought me for my 21st birthday. I'm now 63. It's still sharp and still works well. I have another 3 that came with my machines but they aren't in use. I did buy a pack of 3 at a quilt show once but they were hopeless. They were flat handle ones. They were too thick to fit under a stitch. They sit in a cup with marking pens etc.
Same as all these fancy rulers the makers tell us we need. Our ordinary rulers with degrees marked on them will all do the same job. Also a lot of expensive templates can be made at home. Old xrays make great templates. Just clean the ink off with bleach.
This is just my personal opinion so please don't take offense.