Graham and Ashkahn talk from their (admittedly very biased) perspectives on the merits and flaws of getting involved with a business partner for a float center. Most of the things they talk about are just universal truths for starting any startup. Realistically, it's going to have a major impact on your workload, your decision making, your investments, and even your free time. 

It's worked out well for these two, but the reality is that sometimes having a business partner is a lot like being married. How do you find the right person? How do you handle disagreements? It can be one of the most daunting, and rewarding decisions to make when starting up.