Template for decorative masonry.

Good afternoon.

I decided to build a fence.
I saw videos here on YouTube about a template for decorative masonry.
I would like to hear your opinion, maybe someone who bought it and used it.

Here

https://www.youtube.com/watch?v=KTNWabVSyA8
https://www.youtube.com/watch?v=D-nRgyfZuoE
http://www.youtube.com/watch?v=VANRmDmWptM