The set screw uses a brass threaded insert and there's only about 1/16" of not-very-strong plastic holding the whole thing together (as you can see in the photos below), so if you put even the slightest excess force on the set screw the collar will definitely break

On further examination I found that the little cylinder (stop collar) that clamps down onto the steel stem of the portafilter holder is made of relatively poor quality plastic

Although I purchased mine used from a friend of mine, I love its concept, but based on reviews and my friends experience with this grinder I've read, the gearbox is prone to premature break downs due to the use of cheap plastics

Or perhaps they knew it and tried to save a small amount of money by making the part from cheap injection-molded plastic

My previous grinder had a hard plastic ground catcher and over the years it developed a million micro-cracks.

the fact that it does not have you lose much as there is very little retention in the shoot (one of the main reasons I opted on this model) C) doesn't take up a lot of real estate on the counter D) ease of cleaning

A few things that bothered me in the beginning: very messy grounds all over due to static (I live in Arizona where it's dry always