To put it bluntly, I don't like any of the options. "I will buy it sight unseen" implies willful ignorance. The "probably" option is tied to reviews, which I probably won't need. I'll learn all I need from previews and, if necessary, a personal reading at the bookstore. The little side comments muddy the water too much for me to participate.
I know it's not a science, but there's no point in me responding if I think the poll doesn't represent me.