I'm currently using SerpBook but I don't feel like the rankings are that accurate. Even though I have back-links built to certain URLs (exact domain option is on) it would show it at zero. I like the layout and everything but I just don't feel like it's accurate. It doesn't really track Yahoo/Bing either. Anyway, just a question for others out there who use either tool, which do you prefer and why? I'm considering to moving to SerpBuddy.