I like MFaulkner's suggestion of just purchasing the relevant books and practice tests to save on costs!
I'm quite surprised the polls show such a stark contrast between MGMAT and the rest. Yes, they have some decent books, but the poll results seem a bit unbalanced. I expected to see a more competitive representation overall.
From the perspective of someone who's seen more than a few disgruntled students from other programs, I can tell you we've heard slightly more "unsatisfied" stories from Kaplan, MGMAT, and ManhattanReview than from Veritas, PR, etc. --which doesn't seem to reflect the poll results--but worth noting. Of course, our sample size is likely skewed.
We actually have not had many students complain about a previous bad experience with Princeton Review. Similar to what gmatninja's heard, we've heard students' somewhat unflattering perception of PR--so it appears not so many students give PR a chance. This could explain why we don't have disgruntled students from PR--they don't take PR's course in the first place!
In general, all course have pros and cons. What's good for one type of student may not be good for another.
Would encourage you all to discuss non-big-name companies here as well! And would encourage you all to keep in mind your learning style so you find something that matches your learning style.