The joy of the westalee templates and also some ( but not all) of the other commercially available ones is that they have markings etched on them at various angles to help with placement, which is necessary when you are doing some of the more complex designs and also having those markings means you can eliminate some or even all of the marking you would otherwise need to do on your quilt top. You can do many different things with most of the rulers.
Someone had mentioned that they think the rulers/ templates would be difficult to handle, but I have not found that to be the case. I put some stuff on the ruler to help it grip the fabric and slide the ruler along the ruler foot, the ruler moves the fabric, just as my gloved hand would if I was FMQ without the ruler.
Rob