So I recently entered a homebrew contest (my first) with 6 beers. I did this for a couple of reasons: (1) to see how the whole thing worked, and (2) to get some feedback on my beers. As a bonus, one of the brews (Belgian Wit) garnered a ribbon. But the purpose of my post is to get some responses to the following question: What is the most useful thing that you have learned from the feedback that you have received from a contest? I'll start. One of my beers I entered was a Bo. Pils. Now one of my major homebrewing goals is to be able to brew a good pilsner. The feedback I got on this was that the part of the makeup of the aroma is butyric acid. Now this can come from contamination, among other things. For me this was key, as previous to this I had no idea what butyric acid smells like. Now I know. Your turn.