>>363171880
the defaults work perfectly fine for me, you may have to adjust the maximum neck bend a little if you feel that you're hunched forward a bit too far.
also important note, if you only ever stand up in fullbody, IK tweaks will be a bit better compared to unmodded, but you won't notice a huge difference.
the biggest difference is in sitting/laying down. it prevents your head from being displaced from your fucking viewpoint all the time.
tl;dr no real reason *not* to use it.