Not quite as durable as the OEM wristband.
Update: The amazon seller has refunded my money, and apologized for my bad experience. Where the item quality is Medium, the customer service is Very Good.<br /><br />I put this robin's egg colored band in to service on 2/19/14. The material the replacement bands are made of is ok, but this blue one takes on dirt. As such, it did not stay as bright, and vibrant, as it is when new. It's pretty off-putting to wear a dingy accessory.<br /><br />It is now 4/21/14 and it has broken beyond being able to use. The band is separating along the display "window", which is also cracked around the side, essentially it's trying to split in to two pieces, and is no longer protecting the flex. My original Fitbit band lasted from September '13 to the middle of February '14.<br /><br />The return window for these items is about a month (although as stated the seller refunded my money anyway).
Rating: 3 stars