I currently have 5 plus a serger. One is my main machine that I use for all my garment construction. One is my mom's old 301a that I learned to sew on and have recently resurrected for it's awesome straight stitch, one is my Rocketeer that my husband bought me because I was so enamored of them. There are a couple others that I don't use and should get rid of but just haven't. Its okay to have something just because you like it. You don't need a reason sometimes
