not that it's hard to close juice flow then open it back up , but it's nice just to open and fill. and in the prime, making sure that the airflow ring is pulled down while adjusting juice flow (otherwise it jams) is just another easy thing I like about the nkfl. Those things aren't that much of a pain, really, but I do like simple , and the new lite is.And rewick, fill and resume vaping in under 2-half minutes. No hanky pankies there at all.