Cool. I was using an actual paint mixer for bucket fermentation. Now I'm starting to move to glass carboys, so I bought one of those mixers that folds up to fit into the carboy and attaches to a drill just the same. When I was using buckets, I always aerated and then pitched the yeast afterwards, while it was still swirling to mix it up. In the carboy, the yeast inevitably doesn't all go straight in but some kinda runs down the inside of the carboy. Not a big deal, but I hate seeing some of it just sit there and dry to the carboy. I figure mixing afterwards helps pick some of that back up. But those mixers are so violent, I wonder if you can actually burst some of the yeast cells.