TC's version of the plug is a lot better IMO. How many here have had those TC speed plugs screw up with the O rings? those rings rusting up has been a few problems for people on other forums. A guy on another forum couldnt get his plug in after removing it, he looked at the threads and they were all "chewed up".

i personally have never had a problem with the QRBP with seizing up. Those threads stay as clean as a brand new plug.