Well, I went and did it and purchased a Brother PC420 PRW which the Brother Dealers consider an "internet/Walmart" machine. I got it because of 294 built in stitches, auto thread cutter, knee lift, etc. Anyways, I tried it out yesterday with a black bobbin and white top thread. For the life of me, I could not get the tension adjusted to not show the black bobbin thread on top. In the instructions, it said that meant that the top tension was too tight. I went all the way down to zero and it was still doing it. Am I expecting too much of this machine to not show any black threads on top? I'm also kind of disappointed in the built in decorative stitches and letters as they don't look much like what they are supposed to. It's not a problem to return this machine through Amazon but I would really like to keep it since it has such nice features, but, not if it isn't going to stitch nicely. I tried different fabric and thread also with the same results. This machine was really highly rated...am I expecting too much do you think? I got it mostly for the built in stitches because I am tired of hooping everything to add much pizazz to things.