Product review (5 stars): Improved. Yay!
This manufacturer is at least trying to address the problem of the fitting on the back of the knob cracking.  Yes, the hole is still plastic, but they have put a metal ring around it.  I have yet to see if that makes this knob last longer (this is my third time replacing my dryer knob).  But I can at least see that they've made an effort.  Some reviews say that this is a little too tight to fit on their dryer post, but I'm presuming that is because of the metal ring making it a tighter fit.  I did have to push harder to get this one installed, but it's no problem.  So here's hoping.... :)