I'll be the dissenting opinion. I shot an AI in the Steel City Precision match this past weekend.
The AI is a great sniper rifle, and a mediocre PRS rifle. I'm going to be a little hyperbolic.
First off, the AI offers no flexibility. You are stuck with the trigger and with the stock. The pistol grip on the stock is a piece of hot garbage when compared to almost anything else. The trigger works, but I think it still sucks. It cannot go low enough in pull weight to be a really good PRS trigger. Guys are shooting PRS with benchrest triggers now. This isn't Sniping...this is Bianchi cup with bolt guns.
The other issue is that the bolt-lift is stiff. A 90 degree bolt throw on a custom action basically doesn't even move the gun. You can find your next target and work the bolt at the same time with a good custom. You can do the same with an AI, but it is harder.
Overall, there's no reason not to go with an AI if it's what you want. Most of the really good guys are shooting custom bolt guns though. A custom gun that fits you is definitely easier to shoot.