The cheaper ones that come with the sets are not very good tools. They have better ones, but they cost more. They're worth it to me. The cheaper ones in 1/2" drive are $23.99. The good ones are $39.95. I was looking at them yesterday.

I've never had Sears swap me a rebuilt ratchet, but they once gave me a kit to rebuild mine. The kit didn't do it, so I took it back and they gave me a new wrench.