Here's a different perspective. I have one and it works as advertised on my home table. It's as easy for 9 ball racking as it is for 15 ball racking. Ackward for 7 ball racking.
A friend of mine has a home table too and when he put new cloth on it, I brought my Sardo over and we set up his table as per instructions. Then we put two vertical lines on his triangle rack and two matching marks on the cloth - pretty much the same system that Sardo usesfor alignment. He still gets a perfect rack everytime with his triangle and it has been at least two years since we set it up.
A friend of mine has a home table too and when he put new cloth on it, I brought my Sardo over and we set up his table as per instructions. Then we put two vertical lines on his triangle rack and two matching marks on the cloth - pretty much the same system that Sardo usesfor alignment. He still gets a perfect rack everytime with his triangle and it has been at least two years since we set it up.