I have a friend I'd like to play with who has Diablo 3 with the Reaper of Souls expansion. I don't have the expansion myself.
Will my friend and I be able to play together?
Further, when we hit level 60, I'm pretty sure I won't be able to keep levelling up - but will they keep going on past level 60? (That would be problematic, because of the power level difference!)
Will there be any significant differences in our experience that might be disruptive to play due to only one of us having the expansion?