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.
Room for Improvement:
One of the things we've been wanting to do is to be able to automate off of different highlighted messages without actually knowing what the message is. For example, we'd like to be able to create some generic automation when we receive a warning or alert message to allow, if nothing else, the automation team to know so we can contact the product owner. If there's something we can do to automate or expedite notification to the proper people, we want to try to do that.
It's a very stable product and the releases are really good.
Our company size is around 10-15 thousand. Our ops team is a few hundred people, and it's served us well.
We've had to use it on occasion. They've always been very responsive.
I wasn't involved in the initial setup although I am still working with someone who was maybe 20 years ago. It's grown with us and it'd be difficult to switch.
Disclosure: I am a real user, and this review is based on my own experience and opinions.
Nov 20 2015