The gentleman on the tesla forum is definitely not a pro. There are many holes in his test, imo. There are issues with prep, application, and judging results even when using the gloss meter. I would have done things a little different, but I can see, putting myself into his shoes, if I didn't have the experience I have now, my testing would probably be just as flawed.
Regardless, he is trying to get some objective testing, which is much more than the typical car-specific forum level of "this looks best I have not used anything else" type advice by diy-ers. So I have to comend him for it! How he got a gloss meter and which one, though, is a mystery
As an engineer I will tend to prefer data over opinion, if such data is available. But numbers from an improper test is probably worse than a subjective opinion (opinion at least carries passion and experience in most cases). I would love to have a gloss meter and a bunch of other meters to play with. But we do not get paid to do testing, and there is no incentive from mfgs to pay for such a service. I think Rasky's comparison is still probably the best comparison so far, and he has done this at his own expense and investment.
And on that note, everyone's opinion can be valid! As I mentioned earlier, opinions of people we regard as unbiased, truthful, or righteous still is and has been the standard not only in detailing but in so many areas of interest (food, wine, beer, religion, for example). Technique is almost as individual as the results. While some techniques can seem pretty even, others are not, especially with new or difficult processes or products. Thats just the nature of it. Understanding it is subjective and preferential (or biased) regardless of intent should remove the weight of personal conflict. There is no reason to take anything personal (unless a personal attack), especially on this forum. Marc and I have very differing opinions on some things (in detailing) and it is quite constructive, and I think it helps our results.
You guys should see some of our facebook groups tearing at each other! It is sad to read through sometimes. Lets not have that here, please.