I love doing ruler work. We have the same machine, the PQ1500s. I do just about all my quilting, both ruler work and more traditional FMQ on it. It is very easy to do ruler work at a sit down like the PQ1500s. There's a little bit of a learning curve--mainly remembering to keep the ruler up against the ruler foot. If you haven't taken a class, there is a good introduction to ruler work on Craftsy. It's taught by Amy Johnson. She also has a lot of free YouTube tutorials-- look up Amysquiltingadventures for her blog.
I recently switched from the Westalee foot (the one that comes with the set you ordered) to the Janome convertible FMQ with the add-on ruler foot since I tend to do a lot of ruler work and the Janome is a little more versatile for doing ruler work on quilts that have areas with lots of crossing seams. If you find that you enjoy doing ruler work, you may want to look into the Janome foot set that fits the PQ1500s at some point down the road.
Rob
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