My favorite 2 options are on my Janome 6600 are the knee lifter, (so I can sew using both hands espec on applique) and my automatic thread cutter....oh, and I like the drop in bobbin (way cool there!)oh, and my needle threader to get that thread in the needle....oh, the speed...oh, and the throat room....oh, I better quit now:)As you can see, I just love this machine...we get along so great!! Skeat