I have the last one that came out, Janome 1600 P-QC. L.O.V.E. it! I wouldn't trade it for the world.

The attachment with the spring is the quilting/free motion/ darning foot. The T shaped thing with the screw is a gauge for seam width (very handy.)

Oh and the plate cover can be used with the free motion foot to cover the feed dogs, but I have never found it really nessecary to cover them. Kind of like prewashing or not prewashing fabric...