As a former IBer, I would strongly suggest it. First, you end up with a lot of transfer credits (I think I also transferred roughly 25cr including some APs). Second, the extended essay is a great prep for writing any sort of undergraduate thesis in college. You'll understand the process and time it takes to get the work done. Finally, you'll be forced to learn to be well rounded, since CAS hours need to be done to get the diploma.
Just my two cents! (I'm obviously biased though)