Yeah, the SN150 is an older drive...but a steal at $200. HGST was bought out by Western Digital. It doesn't mean anything about that particular product. Are there better NVMe out there? Sure. But essentially brand new with zero hours and performance, good luck finding a comparable one from Intel, Samsung, Huawei, Micron etc for that price. My guess, someone didn't know what they had and recycled. That's where most of these drives come from. Most enterprise data centers pay to recycle their equipment, even the spares that were never used once they hit their EOL. I've watched brand new $50,000 spare servers get recycled and the company that recycled it, paid to have it removed. Sad, but unfortunately very true and more common that some would think.
As for your comments on Samsung, there are a lot of naysayers on this site. Personally, I think many of them are running their own eBay stores, the ones selling Intel devices in large quantities. The experience I've had with them though is that they've always been stellar...their software aside (but that applies to pretty much every mfr.). Running their consumer products in a server with write-heavy workloads will shorten their lifespan, but they're about as close as you can get to enterprise SSD for the price. I'd put Samsung enterprise SSD up against Intel any day though, including their NVMe. I'm not alone in that respect either.