The original Paragon's were way undersized and reaming them was a chore. The current ones are not as undersized, but the reamer still takes a good amount out.

I recently built 2 frames with tapered 34/44 head tubes and cutting the tube to length was a challenge. I tried cutting the first one on the lathe by chucking it and parting off the excess, but the parting tool jammed and ripped the tube out of the chuck jaws. It mangled the 44mm end of the tube, but I was able to metal work it back into the proper shape and get the dents out well enough to fill them with silver. It was for my wife's bike that will probably never get ridden anyway, so it wasn't a big issue. I turned an aluminum plug to fit in the second one, so that I could tighten the chuck properly, and the second one went much better.

From an aesthetic view point, the tapered ones look better, but I still prefer the Paragon ones for their versatility, strength and ease of mitering the down tube.