I just had a great quilting weekend, and I definitely owe it all to my new walking foot!
I have a fairly old Kenmore sewing machine, which didn't come with a walking foot. About two years ago, I bought a generic "deluxe" walking foot on eBay. Sadly, it had nothing but problems. The motion was shaky and the needle hole was misaligned, so I ended up breaking needles constantly. I gave up and resigned myself to puckered quilts.
Due to reading about walking feet on the boards over the past few weeks, I tried again and bought a "basic" model on eBay. What a difference! Although it is flimsier than the other foot, it works smoothly and easily! I was able to finish up a quilt over the weekend (I'll post it in the "photos" section once the binding is finished). Thanks to everyone for posting to the boards...you've saved my quilts.