All four of my fully bent, system, Petes smoke very well. No problem passing a cleaner, pull the bit and shove it through. Some smokers simply cannot figure out the system pipes, the construction seems to offend their senses. Thousands of system pipes, in the hands of smokers, seem to suggest the pipes smoke well for most people. Those of us who enjoy the Peterson systems can only sympathize with those who can't figure out how to smoke them.