Rapid clearers for me all through the season until the final harvest, the last round goes on porter escapes which means I have no anxiety leaving them a while if the weather turns or other commitments get in the way. They work fine, even the cheap 50p ones with plastic springs.Strange as it may seem, my landowner has some hives and I've seen super stacks cleared with not a single bee left in them through not only Porter escapes but ordinary boards with no eke.
Found quite a few bees still left in supers with rhombus boards (with eke) and one colony where I resorted to a board between each super in the end.