One of the saddle rails on my Arione has a loose connection where it meets the back of the saddle. This causes a very slight noise when I move the saddle back and forth by hand. Once on the bike the sound gets amplified by the carbon fiber bike frame and drives me nuts. Only happens while seated and pedaling. I'm in the process of reaching out to Fizik to see about their warranty since the seat is less than a year old. It took me forever to figure this out.