You'll agree on most things, and when you disagree it will be interesting, because you'll get to look at both sides of an issue together and debate over them. You think in similar ways; your thought processes take similar tracks, ones that each of you will recognize in the other. Your individual reasoning styles and the ways you process information will blend together nicely, so you'll share a feeling of familiarity.
Conversation will flow; your ideas will come out in a tumbling rush and you'll egg each other on. Both intellectually and philosophically, you'll be on a par. You'll enjoy discussing things together, both to form your own thoughts as well as to get the other's take on things. You'll probably share interests in many subjects. Whatever differences there may be between you will be greatly mitigated by this influence, which will act as a bridge between you.