[adanto6840]

I've got a PCIe RAID card loaded with NVMe SSDs on my 2019 MP. It's really great. Unfortunately, the latest macOS versions are not amenable to using other drives as a boot drive (IIRC may be related to secure enclave stuff?). Lots of (third party) macOS apps don't play real well with additional storage devices either, and the OS itself has some (relatively minor) hurdles to deal with, too. For project/data/"working directory"/general filesystem usage, it's great.

That said, up to now it's probably provided me with ~ fastest possible drive speeds available for macOS. For business/dev purposes, I really can't complain (except about price & lack of modern Nvidia support - but alas), even though I'm already using M1 Max these days - the single-core speed is just too good.