So I made the decision to brew 4 batches this weekend, which required the use of some extra vessels. I picked up a couple buckets, due to the lower cost and cleaning ease, but I'm not sure the results are as good as what I get from carboys. Of course, I can't see any activity, so that's a drawback from a visual perspective. I checked and re-checked the tightness of the lids and they're sealed on nicely, but I really only had a short period of airlock activity. I know that that's not the only indicator that fermentation is taking place, but neither bucket really had much more than a 24 hour period of heavy activity. Liquid levels in the airlock have basically stabilized too. I wasn't sure if that's an issue with the process, or simply that the logistics of the bucket (more head space, no tapering) cause the perceived lack of activity.