I've done the upgrade with a Samsung EVO 960 and a Sintech adapter (ST-NGFF2013-C) on a MBP Early 2015 13". That seems to be a relatively standard approach. The upgrade went fine, although it took a little wrangling to get the drive to switch to AFPS. However I'm experiencing random reboots. None of the reboots happen when I'm using the MBP, only after it has been sitting unused. It generally happens after about a week, although sometimes sooner, sometimes later. I haven't been able to figure out what's wrong. It doesn't seem like a kernel panic, as the machine is rebooted, but it is somewhat unstable until I do a manual reboot (VPN client doesn't launch, Boxcryptor fails). I'm probably going to post about this elsewhere to see if someone can help me out.
Other than that, it seems to work well. Good speed and heat seems reasonable. There is a little drop in battery life, but that might be more because the battery is getting old. If it weren't for the random crashing, I'd be 100% behind this.
Let me know if you need more info.
UPDATE 2018-11-07: I've actually found out that the rebooting is not related to the SSD upgrade but something else (problem with multiple monitors and WindowServer). Now that I've figured that out, the drive is acting like a champ!
Thanks!
Chris