We bought two cases of these, and they stuck together so aggressively, that we broke many just trying to get them apart. Frustrating. Also found them difficult to remove from communion trays. Might have been a bad batch, but we'll use another type next time. Not worth the savings if they are so temperamental :)
Our secretary ordered these cups and I as a communion steward and head of the Altar Guild do not like them at all. Not only do they stick together, but they stick in the trays and people have a hard time getting them out as we do not distribute the cups they take them out themselves. I think you need to improve on that.