Love my 6600! Would buy another if needed-er-wanted-er-oh heck!
Have sewn on single fleece, double fleece, sheers for curtains, quilt blocks, paper pieced, fancy stitches, monogramed, embroidered quilt labels (after entering into system), and love the auto-thread cutter feature especially doing PP.
Love the walking foot and 1/4 " foot. I even used the buttonhole maker the other day and got it on the first try.
Sew easy.
There was a thread on here and someone was trying to sell their slightly used one for around $1300 I think. Don't know if she sold it or not.