I too will agree with Mega, if I new what I know now years ago I would have just started saving my money and gone with the PW to begin with. The fact that the hull is supported its entire length is a major difference from MEC. The whole engineered final crimp is also completely different, never had a bad crimp from the PW.
Example:
But, than again if all the stars are lined up just right the MEC will give you this:
Even a new factory uncrimped 10 ga hull will crimp fine with the old style metal dies.