Powermadd is cheaper, unless you buy the blemished ROX. The Powermadd must be bought in the correct width, the ROX will work with any width.
If you plan on never taking them off and using them on something else, you can save some money with the Powermadd.
However, the 2" blemished ROXs can be found on ebay for about $50-$55 shipped. I could not find the blem on the ones I bought.