I had the shorts for less than a month, and alternated this with a couple other pairs of shorts.
Anyway, I started noticing the stitching of the chamois shorts to break. I was kind of bummed since the padding was a lot thicker and was more comfortable.
Then while riding, I squatted down to decrease tire pressure and heard a ripping sound. There was a a 90 degree tear which came from the front zippers.
I contacted Royal Racing and they said that they changed the matrix shorts for 2012 and that the older model had stitching issues.
I sent it back and got a replacement under warranty, and after 3 months haven't had any problems.
Royal's customer service ROCKS!!