I have a Brother DZ1234 serger,
https://www.amazon.com/Brother-Desig...r=8-1-fkmrnull . It has many good reviews on Amazon. It has some nice features, like the differential feed and adjustable stitch width, but no fancy bells and whistles. It needs to be threaded manually. I use it to serge quilting fabric before washing, so I use it fairly regularly. I love it.