I’ve got a few cobs that get smoked every day at work. Some are fairly new (couple months old). One in particular has managed to survive for 8 years! It’s strange that some or most of my MM cobs don’t make it past a few years but this workhorse just keeps on going with no difference in treatment. It’s on its 5th replacement stem and yes, before everybody starts cracking on me.....I like the OE plastic stems.