MZ's have nice bases, some do not however. Some Nours have terribly weak bases, like the ones sold at HookahCompany. KM bases are all just one style, one design, and some have weaker spots in them than others, and mroe bubbles, etc. I would say more KM bases break then other bases because more people buy KM's and aren't careful. In the whole time I have been smoking I have not once broken a bowl or base. Icluding 7 KM bases. And now i have a brand new one, and i don't plan on breaking that.