I love ruler work - I have a huge assortment of rulers for my HQ (right now, HQ does not offer one I don't already have).
Since I have the prostitcher on my machine, I can also use that for straight line quilting, and I can lock horizontal or vertical direction too.
This quilt was done with ruler work for all the straight work, and the computer for the fancy stuff in the blocks
I did have one class on ruler work, and mostly it was about how to hold the ruler and move your hands with it so it didn't pop up on you. there is a lot of moving your hands around with ruler work as you do need to make sure it's staying down were the foot it. I do have a ruler base, but things still came move around alot.