We use it all the time in our ED. It is a safe fast and effective way to stop the seizures. I have seen better control with rectal diastat then IV Lorazapem.
Also never heard of any perfs because of it.
Let me remind you never to give it in a neutropenic patient. We had a Spanish only family come in kid actively seizing, we gave him rectal diastat, then when we got an interpreter to show up, we found out the patient was neutropenic. Hem/OC about had a fit.