Hi econbeliever, industrial organization and econometrics are not the main reasons people choose UCSB, although there are a couple of my cohort who are interested in IO, but it does have a presence. There are also several people in my cohort interested in econometrics. One thing to consider is the strong labor group in the department from whom many econometrics tools are learned (so I'm told). Finance isn't a very big field, but professor Mehra is quite a famous person in this field.
Going in, I was a bit nervous about the quarter system since my undergraduate education was on the semester system. However, now I think the quarter system is inconsequential at worst. The nice thing is that we get taught from 9 different professors over the year as opposed to 6 or 7. Also, spring break is right after finals in the Winter quarter instead of being in the middle of the second semester. I know that in other semester programs they give two tests and a final for each semester, which adds up to the same number we take. But in comparison to programs that don't test as much, I'd say having more exams is more beneficial as preparation for prelims. Collaboration between students is quite wonderful here as long as you are willing to collaborate. For example, we setup a google group to share problem set solutions and other helpful files.