I was also admitted to IRPS, but I'm still waiting to hear about UCLA MPP. After visiting both schools I felt that UCLA was a strong quantitative program with a somewhat flexible, unstructured specialization curriculum, where as IRPS is incredibly structured with a regional specialization + language requirement, and policy/area focus. It depends what you are after. On the west coast it seems like you can't beat IRPS for international affairs (particularly pacific rim). If you are really committed to IR than IRPS is a pretty fitting program.
Good luck!
