Novoflex adapter experiences?

Of my two adapters one is the cheap all aluminium type (25 €), the other the medium priced variant with one steel mount towards the lens (50 €). Both have some play: they can be turned a little bit and wobble slightly. This certainly can have some negative influence on IQ,

Did anyone try the expensive Novoflex adapters? Do they wobble, too? They should not at prices beginning with € 120.- .

And how about the Metabone adapters? They are around € 70.-.

Peter.