Tl;dr
The Griswald's upgraded to DSM 7, and all is well!
Our setup:
4-10TB WD Reds
2- 500GB Samsung 970
2- 4MB Synology RAM
After doing a complete backup, I reset my DS918+, and did a clean install of DSM 7. Currently 11 days uptime.
My experience has been good, and the only issue was the length of time to wipe/initialize my HDDs.
The new GUI is responsive and the NAS appears to use system resources more efficiently (as per the graphs).
The Family is iOS dominated, so I didn't want to upgrade, until Photos had begun to work properly with Apple products.
Synology Photos has been a smooth transition from Moments. The Facial Recognition feature is a nice addition, and working well.
We don't use Plex, so I have no comment regarding its functionality with DSM 7.
Since the Final was released, Synology addressed many of the issues within their core apps, and the current DSM release and app updates has our DS918+ working as expected
