Are My Michelin Tires Dry-Rotting?

Mine did the same, although I think I only got 50% replacement. What bugs me about this is that I could have bought different tires, say BF Goodrich or whatever, but shelled out the extra $ due to Michelin reputation only to end up with potentially unsafe tires. I was heading out of town with the rig next day and didn't have time to research different brands and essentially overpaid for tires that I'll have to replace prematurely again.

I'll likely go with a different brand next time for my truck, as well as for all my other vehicles.