@deckingman it really seems to be a matter of construction; I can't say that I had heatcreep related issues even with PLA sitting in the hotend at 230C for half an hour to an hour. But then I don't worry about my 4010 hotend fan noise levels (either by virtue of a lack of good hearing, or because other components of the printer quickly drown out the fan noise as soon as it is printing).
@o_lampe I would say all commercially available all-metal heatbreaks these days come with smooth insides, the early reprapped all metal heatbreaks required more care. But the slice copperhead inspired bimetallic heatbreaks with surgical tubing pressed into copper threads or Ti5.5 based all metal heatbreaks all are smoother than a baby's butt (that's a technical term).