Derail here but, it's crazy how many people are doing these crowlers nowadays. I've never seen one in my area, but heard of them. Then at Best of Craft last month, I saw that probably 20% of the entries were in crowlers. (No, I didn't see them till after the judging was over) Brought a few leftovers home with me.
I can see the pros and cons of it. If I were at a brewery and sampled the lineup, I think a few crowlers of my favorites would be far ideal to big growlers. Crowlers have to last longer, but once you open it you are committed.