I think excess dripping after the system shuts off is more an issue for closed in vivaria (i.e. dart frog tanks) that would be severely waterlogged from the drips. If you have a good drainage system for your chams, it would be a bonus to have the drips rather than a burden, because like Nick said, more opportunity to drink! I don't think the zip drip add on is at all necessary for a cham system. Some people might like it better, though, because it looks "cleaner" to have the system just shut off completely and not drip after a cycle.