I've spent some quality time in the last few months searching and reading all the threads that I could find about GSK's. The one thing that I can't determine is if one maker/seller is better than another. I know that they can be bought from Piers, TST, and even some lesser-known "private" sources (some in the TDR classifieds). Is there any advantage in product quality that comes with dealing with one certain maker/seller of the GSK's. No bashing, please. Just looking for straight shootin'.