I have not. The docs (or lacktherof) keep scaring me off. I've really liked compose for the easy of control and yaml I guess. Pacemaker has a built-in integration for compose that is working okay so far. It's an easy transition.
Discussion
Probably still worth learning, but not sure how well I can integrate it into a multi-node cluster. It does appear that pacemaker seems to replicate unit files but I'm not fully sure.