I recently trialled Roon through my Zenith Mk3, and much preferred the sound without Roon. Having looked at a number of similar threads to this one, I believe this is consensus.
With Roon I did notice a drop-off in detail, and a warming. And while I like warm, digital systems I felt the effect of Roon to be too much. The DSP facility which is packaged with Roon, however, I did like. The Roon apps, both Win and Android, are very well put together and have many features. Innuos's OS is not as good, though for me it's good enough.
I expect a lot depends on your streamer, though the overhead of hosting an additional Roon Core, on top of Roon's subscription cost, is not worth it, in my opinion.