Having finished my first attempt at ruler quilting a whole quilt my verdict is a bit on the fence.
I'm glad that I didn't get the Westalee sampler set as I think I would find most of the templates rather prescriptive. I would be much more inclined to use arcs and curves that can make any number of designs. The only ones I can see in the Westalee range are
the set of 5 arcs but they are rather pricey. I think I would probably rather just get better at proper FMQ.
I did find one issue when I changed my sewing machine before I had finished quilting it. I went from a Pfaff Ambition to a Pfaff Quilt expression . I found that on the new machine the IDT foot hangs down lower when it is disengaged and because it does its 'walking action' even when disengaged it was pressing down on the ruler when the ruler was behind the foot and making it rock. Behind the foot is the place where you would want to use the ruler least but sometimes I found that I needed to or that because I was doing an arc it ended up under the IDT because of the curve. I had been looking at the Parrs templates (somebody mentioned them but I can't find where now) but as they are all cutouts in a plastic piece there will always be part of it behind the foot. Same goes for a lot of the Westalee ones.
This is what I did with the arc template that came with the foot. Nice overall effect if you don't scrutinise it too closely. [ You are not allowed to view attachments ]