As Prism99 stated the Babylock is the serger to own. They are not inexpensive, but well worth it. They have a serger that doesn't have the coverstitch which is less money. The threading is very easy, but more important to me is you select the stitch and it's perfect. There is no 'tweeking'. I have owned a White (still have) and a TOL Viking. Have serged on friend's Bernina and another TOL Viking. One afternoon, with 4 sergers mind you, we could not get a perfect rolled hem. The next day I went to the Babylock dealer. I've had the White for 15 years and sewed a lot of clothes without the cover stitch, but it is nice to have.