I can just say this about it.
I"ve been building my own desktops since 1994. With a lot more income then when I was working, I'd budget my builds and pinch pennies. I never overclocked until around 2005. Even after that, I was recycling old junk OEM cases. I became keen on using better parts where it counted, for instance power supplies. Storage was another thing: I never wanted a workstation that was over-provisioned drawing more power.
Then, after we graduated to SATA SSDs and then again the NVME drives, there was always a place for some spinners. And I started using 2.5" spinners instead of the heavier 3.5" ones. So when I built my most recent system, I'd already experimented with PrimoCache so that parts purchases and their intentions had PRimCache in mind. Right away, I used a 250GB NVME for L2 cache. I chose 32GB of RAM so I could avail of the L1 feature. I have a 2TB SATA SSD, and two 2TB spinners -- one of them for Macrium backup.
Never had any drive errors, no signs of storage components "going south", none of that. This system doesn't have Optane. Some folks at the PrimoCache (Romex) forum have experimented with Optane PCs and Primo, and for my quick scan of the thread, nothing wrong there, either.