We used to us an IBM product, but OPS/MVS has a lot more flexibility in what we can do with it.
We're able to do a lot more ad hoc-type things. We can set up for different events, or do out-paging for a mainframe interface, or issue MVS commands. It's flexible enough for us to use it when needed outside the normal automation flows.
We obviously also use all the basic functionalities of it, like time-of-day, message, and other command rules. Command rules are especially great when our operators have repetitive tasks.