This unit seems simple at first glance, but the ease of installation and overall quality of this product has been incredibly impressive. I own two other high end Japanese brands that are more permanent installations at my work, but the fact the Slim Glow Attachment is so simple and effective has inspired me to purchase another simply for times I travel for extended periods. Now I'm sure the hotels don't want people messing around with their plumbing at all, but it's just too good not to have on hand and small enough to travel with!