hey guys. I´m occasionally getting the dreaded S-turns when flying the NGX with ASE. Is the only way to stop this to register FSUIPC (which I don´t mind btw)? I just wanted to know so that I won´t buy it for nothing

FSUIPC offers so much I do not know why you wouldn't want it. Especially with the autosave feature and calibration etc. The only other option if you don't have FSUIPC Registered is to tick the box to disable turbulence option in FSX Weather settings. This is the most drastic way and will remove all turbulence. With FSUIPC registered you will still have some turbulence.

I´ll take your word for it and buy it Paul. I think the dude deserves the money anyway, I´ve been using it for literally years now

Simply, yes, buy it, it's the only solution.