Perception of quality is a big issue. What is quality? It's a subjective assessment. Even Dr. Deming, the guru of what came to be known as Total Quality Management (TQM) taught that the consumer's perception of quality was paramount. What makes one regulator "higher quality" or "premium"? Performance (a subjective can 'o worms all on its own), materials, fit, finish, reputation, industry standing, longevity, marketing, price, serviceability, customer service? It's all of the previous qualifiers, and more. The qualifiers you choose influence your perception. Is HOG just as good as Scubapro, Apeks, et al? Depends on your definition of quality.
Are "off-shore" (non-North American/European) manufacturers "world class"? I work in Quality Assurance for the DoD. In my experience a much greater percentage of off-shore manufacturers make inferior products. Some off-shore manufacturers however, make great products. Are ISO certifications an assurance of higher quality? Not necessarily, but lack of the certification overwhelmingly indicates lower quality. How does the look and feel of a product affect your perception; when the look and feel of a product where appearance and feel are secondary? Compare a Snap-On wrench to a Craftsman. Will they do the same job, within 90% of their maximum tolerances? Which one would you prefer to hold in your hand? How confident and comfortable are you with your choice of regulator? Does confidence in a manufacturer's product and reputation make diving less stressful for you, or has your experience built confidence in your choices?
I considered HOG regs recently. I was ready to buy, but an amazing deal came up on Craigslist for a set of "premium" regs, so I went that way instead, having them completely overhauled and upgraded. I took the equipment specialty a few weeks ago, rebuilding my current Sherwood Magnum regs. I really wish I was more knowledgeable about regulators, and could do a valid comparison during teardown, educating myself. Unfortunately for non-professionals, those who are professionals have a dog somewhere in this fight. Manufacturers believe in their product. Retailers have a vested interest in the success of the brands they carry. Even LDS employees are "encouraged" to use house brands. Unbiased third party professional reviewers can even be suspected of undue influence. Consumers can build loyalties based on limited experiences, defending their brand with a vengence: GM vs. Ford vs. Chrysler vs. Mercedes, etc., etc.
Grrrrr.