I know these are Martins new limbs as of this year and are suppose to be a top notch limb. I have shot my Martin Silencer a few hundred times and still love it and have had no problems with my limbs what so ever. I have seen at most 3 reviews of people having the new power tough limbs crack on them. Now I know that there are going to be limb cracks with any bow, that is just the nature of the beast. I am 100% sure that BowTech, PSE and I know for a fact Mathews has their fair share. But I am just trying to see what everyone thinks of them and see if there has been a large amount of limb failures. Thanks guys (and gals if you are out there).