I own a Viking 910 serger--didn't feel I needed the cover stitch--have used it for making clothes and edging around fleece & flannel baby blankets--have made quite a few pairs of fleece socks with the ladder stitch, haven't used any of the various accessory feet. I used it to make Kay Wood's 6-hr quilt. Wouldn't be without it. Mine has the windows that tell you how to set the machine up--I had a Riccar years ago and hated always testing the stitches--even when I wrote them down they would be different for different types of fabric, thread, etc.