Any of you guys have experience with Harbor Freight 4 1/2 inch cut-off wheels? Are they any good? There's one guy on YouTube that says he had problems with the metal center hub ring ripping out of the fiber portion of a Hercules. So I figure if the Hercules is no good then there's no point in trying a Bauer or Warrior. I've been using some Radnor wheels from Airgas which are very good, but they're pricey at over $3 a piece.