Marti Mitchell has several sets of templates. I have two sets that were required for a 'PatchWork Party' that I did. The thing that I remember about her templates is that you don't have any dog ears on your pieces and they match up very well.
One thing I don't like about them - and it's probably just the sets that I have - most make small pieces. I hate to work with small pieces.
I guess that other than the blunt corners, I don't see much difference. Okay, if have a set, you don't have to measure anything. The template is exactly the size you need. The one set I have, there are seven pieces to it.
Not much help, am I?