I didn't want to quote your whole post as it was quite long with the pictures and texts.
This is the problem with the automotive aftermarket. Most people don't know the history and background of a company and only go by price or reputation for the most basic items with no real information and the effect of the item, for instance your example of the Mishimoto can. Mishimoto was and is a knock off brand with little to no R&D in any of their products, like most companies, whether they are ebay sourced or even "reputable" shops that just rebrand Chinese/Tawainese knock offs.
The auto enthusiast needs to inform themselves in what they are buying and the effects of what they are buying. In all of my research, I only felt their were really a select few cans that I would have bought myself for my 95 TT Supra, 67 Yenko Camaro, 92 Civic, 97 98 99 SC300, 93 94 95 MR2, 00 Integra, and most recently my 14 Sierra. Other than my Sierra, I went with the Saikou Michi can, as it had the best design I believed would work. All my others were custom setups. The RX can came up in a close second if not tied for an easy mod not a custom can.
Informing oneself in what you are adding to your vehicle is the main thing that as a whole our community is lacking. I commend you for adding information for everybody to review and learn, but choosing the worst cans you can think of and comparing is a biased comparison in my opinion. To many others it is not because their lack of knowledge in the subject.
With that said, GDI Tech is steering everybody in the right direction. Take his information in and do your own research and decide what is best for you. There are plenty of information out there on the internet from Japanese import forums, European Import forums, and Domestic forums to help. Pretty much, if a company will not have documentation how their products are designed or work, they probably aren't worth it and just smoke and mirrors. Don't go by just looks.
I would love to name a few companies for yall, but most are custom one off parts and that is not what the majority are looking for. But for our community with the basic bolt on and minimal work, I would go with RX and Saikou Michi for yall.