John B.I've been using it since it was called FancyCache (many, many years ago), and have never had it cause any instability in my systems (I run it on multiple servers/workstations/gaming machines now).
JvanderlindeI'd recommend Primocache to anyone looking to speedup their notebook, PC or workstation in general. It takes some tweaking but once settled down you could see, experience and even benchmark the differences.
A. ZinchenkoI used PrimoCache with Intel Optane on AM2 platform and Win7-64-sp1 to show that caching may be really fast on old systems. I also tried your Ramdrive and found it super for browsers profiles.