Consumers buy Stern pinball machines in good faith under the promise of an advertising blurb.
The product they receive does not match what was advertised; if the model that you bought is popular then you might get code updates however if it is not then you are stuck with a substandard product.
People are complaining because the after sales side of things are not up to scratch (poor build quality, code updates etc).
I understand the production line has to move (new titles) however the after sales side of the equation needs to be addressed.
Unfortunately until NIB sales are affected, I don't see any change in the Stern business practice/model.