i agree whole heartedly about the ls-32 for stg's........i see a noticable difference in my play with sanwa sticks....
however, i find ls-32's are pretty bad for fighters.....
i recently picked up my second new astro city which im using as a (pretty much) dedicated hori cab for fighting games....its got ls-32's installed....i find them very awkward for half circles and streefighter-esque move systems.....
mind you i havent been playing fighters at all in quite a while.....but i notice a difference for sure
but as always i think it really comes down to personal preference and what you are comfortable with and what you are accustomed to.....
im sure if you had always played stg's with sanwa sticks and then played with an ls-32 it would more than likely have a negative impact on your performance
whatever you choose, it will still be better than using a pad

im actually looking into modding an ls-32 with an ls-55 spring, which from my understanding makes it even tighter.....sounds perfect for stg's and danmaku in particular