From what I've heard, all stability issues with NVMe in the PBP can be solved by using one of the "known-good" NVMe models. For me the main benefit with NVMe over eMMC is that it doesn't stumble during heavy I/O. I have the adapter as well but have for other reasons not bothered installing anything. Once I do I'll settle for a $35 128GB model, as that's more than enough capacity for my needs.