'Never had a problem with a MM cob. Some people say they like them because they're disposable, but after you break them in and really become attached to particular ones, they are anything but disposable, and they last (in many cases) for years, decades. My only issue is that I like to either buy the pricier ones with a stock acrylic stem or retrofit them with Forever stems, or similar acrylic stems, since I chew through the softer plastic. Once I make that upgrade, I'm a happy cob smoker.