I have the Janome 6700 with the O2 quarter inch foot. It does give a good 1/4 inch seam, but I still have the problem of the top fabric ending up a bit "longer" than the bottom fabric because the top doesn't feed. So I bought the accu-feed quarter inch foot. with it, you have to move the needle over to about 5.5. The problem is, the quarter inch guide does not extend out beyond the foot, so it was difficult for me to keep the fabric aligned exactly next to the guide. I finally bought a low-end Pfaff with IDF and now use it exclusively for piecing. About the only time I use my Janome is to attach my binding.