The machine quilting is nearly done. I really like how it's turning out. The lines on the back don't perfectly match up to the piecing, but I decided to let that go. I'm making a blanket, not doing heart surgery, right?
As for the spray basting, I find myself having to reposition the top and backing pretty much as often as when I pin or baste with thread. So I'm accepting this as part of the process and saving my money next time!