I haven't used my 15-91 in about 8 months. It is left up (it's in a cabinet) so I will remember to use it from time to time. My go to is the Janome MC6600 because it has a thread cutter and a needle threader (that I don't use as often, but I love the the thread cutter). My little FW gets used when I travel - same with my Europro. So this year - they have not been out of their carriers.
My Sewing Machine Repair guy showed me a belt that came off an old FW, it was stiff and brittle in the shape it's in on the machine. He said other than the belt the machine was in good shape. It was a white FW so I almost asked if it was for sale but refrained.