So I walk into an Apple Store last week, asking how much they would charge to upgrade my 256GB stock SSD to a 1TB on my NOS 15" 2015 MBP. The guy tells me they don't do that and that I'd have to take it to an authorized Apple Service place, or look on Amazon and hope to find a lucky deal on a Samsung like the ones Apple uses (which run on average $700-900). Then, seeing the slight despair on my face he mentions this brand, "HAT", saying to simply type it in Ebay as I won't find it anywhere else. Tells me they are great but nothing more, obviously not supposed to be boasting about another SSD brand, in the Apple Store he's working at, and while on the clock, no less, ha! https://www.ebay.com/str/HatSSD/ Oddly, there is ZERO info about this company when doing a simple Google search, but they are real, they do exist, operate out of Alabama, but that's all I can find. The reviews from eBay buyers are rather positive, and at $350 for a 1TB PciE SSD for a Macbook Pro, with NO adapter needed and loaded with the OS, it's too hard not to investigate a little more. I'm tempted to pull the trigger on one, but has anyone ever heard of this brand, or perhaps even use one?