While I haven't been actively searching for new machines or cabinets for a while now, I always hoped for a 401 Slant-O-Matic to complete my collection. I love my 503 Rocketeer with the two dozen cams for different stitches. I love my 301 for fast, perfect straight stitching. I loved my 404 for the same reason (I gifted it to my mom.) Somewhere in there, I've always wanted to try a 401, which was supposed to be Singer's TOL machine of it's day.
My husband happened upon this machine at an Estate Sale. A beauty of a 401 (it was clean and well maintained) in the cabinet, with the stool, original manual, and complete set of attachments for $50 - What a deal!