I have been looking around and reading, but I do not see the point so far of going light side or dark side. From what I see it does not affect the guild you can join, that is based on faction, it does not affect the spells you get.
Does this really only change the story line? What happens if I want to be a dark sith and my buddy wants to be a light sith, can we still do flashpoints together?
If I completely missed something please help me out, if I haven't what is the reason to even pay attention to this apart from RP.