Based on feedback on this thread, I thought I'd give Sense another chance. I updated Zenith to the latest 2.0.8 release. It seems to be more stable now. I listened for a few hours yesterday and the app (iPad) did not stop responding even once. So that's definitely good news.
I'm not sure if it's due to improvements in the latest release, or perhaps my unit has more hours on it, but I'm going to agree with others that it does sound better than Roon at this point. Key differences I noticed: blacker background, more balanced sound, tighter bass, and an overall more refined sound. I listened to about 10 songs and went back and forth between Sense and Roon for each song. These differences were obvious on pretty much any song I listened to. Once I got used to Sense's sound signature, Roon does sound a bit less refined -- it has more bloom (not in a good way), the bass is looser (comparatively speaking), and vocals are more forward sounding (which might not be a problem for some).
Having said that, the user interface -- specifically the additional info on artists, albums, recommendations, etc. is still far, far superior to Sense. Also, Roon Radio is a killer feature that I hope Innuos is working on for their next release.
I appreciate the thoughtful comments on this thread.