I have owned two KB Alex bags for years now, and they have stood up well. I originally bought the putty color and the straps have started to peel. It is still functional, but I tend to use my gold luxe more. The straps are more heavy duty and seem to stand up better to wear and tear.
I use my bags probably 5 times a week and they look great. It is a bit snug, but they love each other, so they do well. When we go to pet friendly places, I let them stick their heads out, but they do fine when we are sneaking as well