Oh my, I just gave one of those to a friend of mine. I needed the space and she wanted a back-up machine. I had originally paid a friend $45.00 for it - I already had the cabinet. Personally I like the stool - it looks like the one my mother had which somehow disappeared. Have you sewn on it? It is an extremely heavy duty type machine, mine sewed thru layers of denim like it was nothing. Once I got my 15-91 I didn't need it anymore. Afraid that doesn't answer whether it is worth $55.00 or not. That would depend on how well it sews, what you need it for and will you use it?
My cabinet looked like that but it was from the 80's and that was not a drawer in front, the handle was just a decoration. Since I got the machine from a friend I have no idea how old it was.
Good luck in whatever you decide to do.