I've finally gotten around to breaking in some, and there are some discoveries which IMO are a bit unfortunate.
First of all, the springs ping way more stock than the samples I received, they had virtually no ping at all stock - this isn't a big issue as lubing springs is standard practice these days.
Second, the samples are a slightly different hue in color, but not too noticable - I think they came out good.
Third and final, the samples were a tad bit smoother in my opinion, but the production samples are smooth as well - like to be expected of gateron.
Lubed up they are quite a nice switch and sound well, stock - not so much; but then again, which linear switch is amazing stock besides creams?
I am happy with the end result, but a few let downs compared to the samples.