Got these two Raleighs at $180 each a while back. I will now explain the problems with them:

Brown
When shifted to second, the chain(I think) doesn't actually grab at all, so you are peddling into thin air.
Brakes scream like a banshee.
When you go over a bump, it shifts itself.

Black
Same as the brown one, shifts when you go over a bump, usually from 1st to 2nd.

I have slowly realized I probably overpaid a lot for them. Recently tried to sell them but no luck so far.
Had the idea of turning the black into a project, replacing the wheels and slapping a derailleur on it. Curious if the frame on these is worth it. They are both Raleigh Sports btw.

Also advice would be awesome.