Would you pay $400 for a featherweight, in good condition (so it's advertised)? The very first machine I bought was a 15 year old White, and I used it for 35 years. At the end it just wouldn't do the job - bobbin continually got messed up, had to pull the fabric through, etc. I'm a little leary of older machines. There seem to be a lot of used Kenmores. Are they worth anything?