I wrote about a Craftsman one late last year -
There are some decent models for under $100. An inexpensive reader is better than no reader, although the more you spend, the more features you get.
There are some really really cheap ones for under $20.
Is there a particular model you'd like to see reviewed? I used the Craftsman, and when I have a chance I might try to trick my car or my wife's into spitting out an error code (gas cap open?) to test things further.
As far as bench vises go, oh boy. I bought a Veritas quick release vise, and will be using it for a new bench build in a few months.
I might work in a Veritas tail vise as well, and a leg vise might be in the plans as well. I'm drooling over Benchcrafted's tail and leg vises, but it remains to be determined whether I could justify them.
I don't think I have any interest in a shoulder vise, sorry.
Less expensive vises are often usable, but for my upcoming build, I plan to buy once and be done. Some front vises can be installed quick and easy, but others and other vise styles require major irreversible surgery to a benchtop or legs.
Do you have any specific requests? But to be frank, by the time I build my bench and am ready to start testing other vises, you'll probably have made your purchasing decisions already.