Summary: it is not worth the effort.
I did the Client and Content upgrades and I am not impressed.
VRAM usage is not better, I do not see any improvements, and there are issues primarily with airports.
There are work-arounds with the issues that USUALLY work, but I did not have any such issues with v5.1HF1.
I tried this type of upgrade as my mobile data cap is low.
I mainly fly low level in GA in True Earth.
My system: i7-9700, 16 GB RAM, RTX 1060 with 6 GB VRAM, 2TB SSD, Win10.