You'll enjoy a lot of mental stimulation in this relationship. Your minds will really mesh, and you'll both bring something of value to the ongoing conversation. You'll enliven each other's ideas and you'll both feel easy and free about saying whatever you're thinking, in part because you'll know your ideas will be received well.
Even your disagreements will be stimulating. Your arguments will often be constructive discussions rather than destructive messes. You might even enjoy arguing out your differences, but at the very least, your relationship will benefit from the communicative openness between you. It will be rare that either of you bottles anything up. And because you'll both know you can be as up-front as you need to be with your thoughts and feelings, you'll both become more self-confident through the course of this relationship. You'll help each other develop strength and presence that you'll be able to use in all areas of your life. You'll rarely put each other down or make each other feel small. Even if there's competition between you, you'll see each other as equals and treat each other as such.