Ask HN: What did you learn from your most recent performance review

Since we're ( http://beta.rahfeedback.com ) aiming to build a start-up friendly automated peer review system that doesn't suck we're interested in whatever you'd like to share with us about that whole process, for example what worked, what didn't, what you learned, what you would have liked to have known more about, etc. If you do give us said information please let us know what size company you're working for.