Okay, I guess I deserved that. I have edited my post to be a little less gushing and more realistic.
To answer you question, GB pays me nothing, and I actually do not own any GB gear, because for the time being I cannot afford it, however I have spent probably a total of 12 hours at the dealer playing the STLMX 12.0 thru various cabinets and thru headphones and A/B'ing against other featherweight heads including the Markbass LMII, SD800, and EA IAmp Pro. I prefer the GB heads in terms of SOUND to the Markbass and EA offerings by a long shot. As stated in my edit, I find them to be sonically superior to the others.... how I quantify this is largely a matter of opinion as it relates to what I enjoy and find valuable tone-wise. Anyone, anywhere, who says that one amp is "better" than another is guilty is positing their opinion as fact. I'm just as guilty as the next guy in this respect, and were this a punishable offense, I'd venture to say greatly more than half of all Talkbass members would be sitting in the penalty box.
So again, to be clear:
In terms of some very hard to describe intangibles that mean a great many different things to a great many different people such as "Signal Integrity" and "Sonic Clarity"..... I find the GB to be superior FOR MY NEEDS AND IN MY OPINION, and it is my suggestion that those looking for a slightly more "modern" or "clear" sound, will likely prefer the GB to the MB as well.
Although several times in my 5 years on talkbass I have been guilty of expressing my opinion in a way that may seem a statement of fact, and have done perhaps more than my fair share of "gushing" over certain gear, my opinion has NEVER been for sale to anyone at any price, and the offending post was more a matter of me being a little to glib on the issue. You have my apologies.