Looks expensive for what you get. My 7i5 NUC sits in my server “rack”, unloved and unobserved but chugging along nicely. And I’ll let it do that as long as I possibly can, and then (if cores aren’t in the cloud by then) I’ll buy the least expensive thing available.
I have a similar generation / spec NUC that I bought for other purposes. It’s an ok computer and I think it would be a very competent ROCK core but depending on where you plan to install it, you might find the fan to be very loud. Mine is the short version and perhaps that contributes to fan noise but I’d worry about installing this anywhere that it might be even remotely audible.
Akasa makes silent cases that can be found on Amazon in the US for reasonable prices. You might be able to piece together a silent NUC based on an Akasa (or similar) case and a NUC board kit if you can find the components. It would be a pretty easy assembly as far as such things go.
Mine is clean but I should be careful about assuming my experience with the NUC will translate to what happens with Roon. I tried using it as a small, desktop PC. Things like Zoom/Teams were enough to get the fans going full blast and they’re loud enough to be obnoxious in that context. I can easily believe that under steady state, Roon wouldn’t drive it hard enough to spin the fans that fast. I also know that there are BIOS options for fiddling with CPU speed/boost versus sound. If I recall correctly, you can choose between performance and fan volume, and I had mine tweaked to CPU.
I’m handy with this stuff. If I were going to switch to this NUC as a Roon Core, I’d probably try it as is and if it turned out to be loud, I’d relocate it into a silent (probably Akasa) case. That’s a bit of a challenging operation, though, for folks who don’t have experience with PC builds and, in case anyone is tempted, I think you’d probably lose WiFi unless you did a custom antenna setup.