I have only had a strap pop on me once - and it was my fault for expecting them to last over 3 Chicago winters with no problems. They made it through two.
I check my strap religiously now since they are both drivetrain and braking system components - knowing that the nylon eventually will give way as will the leather. I have owned a set of Errebi Sprint doubles for two years now and they are starting to show signs of wear - but no cracking yet. I blow threw singles pretty quickly for some reason. Maybe I need to sinch them up a tad as looseness might be part of the equation.
And to add to 11.4's suggestion regarding singles over doubles because you don't need to throw out both if one goes bad - just cut the bad one free (from the doubles).