Several months back I bought a Juki MO 1000 and I love it. I had an older Pfaff before and it serged wonderfully but the rethreading from overlock to coverlock cost me precious time. So I decided the best fit for me was an overlocker and a separate coverlock machine and it is a great set-up. I sew a lot of apparel for my grands and now I can go from machine to machine without losing time. I bought the Juki new and found a great deal on the Babylock Coverstitch. Both have air threading which I love also. I highly recommend the Juki, I did days and days of research and this is a great machine for the money. It especially does well sewing curves and the flat lock hem is super easy to set up and is a beautiful stitch. Here is a You Tube demo of the Juki.
https://www.youtube.com/watch?v=a-jVaoJdP6M&t=548s