Lots of LE agencies carried .45 GAP for years, including GSP. From what I understand most of the officers who have carried it really liked it, and in real world street results (though pretty hard to obtain accurately), officers admired its performance... All I know is I liked it. It was a very good performer on paper and water bottles. Lol
Friend of mine was the first LEO to use the .45GAP against a perp. It worked fine.