There are some in depth reviews of it on Overclock.net. Some people reported jitter at 2300 dpi (not the kind that you would feel while using, but the kind that could be exhibited in MS paint during directed testing). The popular opinion is that this jitter has a lot to do with the type of mouse pad that you are using; the mouse performs much much better on solid colors than it does on mousepads with different colors or patterns. The other thing to note is that it uses Huano switches which are stiffer. Some people say that this makes their fingers tired, others say that they like the more tactile feeling of the clicks. I've used this mouse and I would say that for FPS gaming I preferred the Huano switches, but if I were an RTS gamer I would probably prefer softer Omron switches. I think the only other things to mention about the AM from my experience with it would be that I really liked the mouse feet on it. They had a very smooth and more importantly very consistent glide on my mouse pad (Artisan Shiden Xsoft white).
If I were looking specifically for an optical mouse based on sensor performance, I would say that the new revision of the Logitech G400 is potentially better than the AM simply due to it having less issues with mousepads that have patterns on them, but for ambidextrous mice I personally like the AM the best out of all the options on the market at the moment. The only reason I didn't mention the G400 in my first response to you, is because its ergonomics are different than the Ikari, and it's nothing at all like the Sensei, and those were two of the mice that you mentioned specifically so I assume you have an idea of what you're looking for.
As for how hard it is to swap mouse internals, there are users on Overclock.net that do it, but I assume some of the restrictions would include things like does the pcb actually fit the shell you're trying to put it in, can you get the sensor anchored correctly, etc. There are a lot of potential variables that could throw a wrench in those efforts I'm afraid.