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I've had mine a couple years and still like new.Given my ongoing frustrations with the (not so) cheap or cheerful M&W plastic callipers, I think these look worth a try
The wheel is supposd to slip, It's there to help provide a constant pressure on the measured object so you can get consistent readings. You don't have to use it and most people develop "the feel" for the right amount of pressure over time.
it's the verniers equivelent of a ratchet on a micrometer.
Gerry
"slipping" may not be the correct description - what I find tends to happen is the the zeroed setting changes (i.e. zero with the jaws closed but the open jaw measurement isn't consistent/accurate)
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