I do my piecing on a 301 and love it! The price seems a little high to me also, but if it has been serviced, looks to be in good cosmetic condition, is a long bed, and comes with a book and the attachments, that would make it valuable.
The 301 weighs about 17 pounds and is easy to take to classes. There is a handle on the top of the machine. It does NOT zigzag without the attachment. It has a slant needle, which adds to the ease of visibility while sewing. It shares a few parts with the Featherweight, such as the bobbin and tension assemblies. Compared to the FW it has much more space in the harp area. People love the stitch.
The 301 is collectable as well as durable. I don't know if you want to part with as much money as they are asking, but I don't think you would ever regret having a 301.
Dayle