i've been shooting my 9mm AS in production IPSC for a month or so.. and doing quite well
the only thing to consider is.. the lack of external safety means that during "load & make ready" i have to de-cock the pistol prior to putting in the holster. this makes the first shot of every string a double action.
impossible to control double tap, when the front of the pair is DA and the back is SA
the only other problem i have is finding a decent holster.. something that its off the belt an inch or so for faster grip.
CR Speed custom made me a piece, but it was no good when it arrived. all they did was modify it to fit the width of the P99 trigger guard. there's no retention at all
i'm using a fobus until i can get something made