the old one is even worse than it looks in the photo. It's got valleys in it, and lots of bits of thread sticking to it... Frankly, it's a wonder I can cut on it at all!
[edited to day - this is actually the better side of the old mat - the other side is even worse and has paint stains on it, too! - and I do change my mats fairly regularly - this new one is at least the 4th or 5th I've owned since I got into quilting and fibre arts on a serious basis...]