Prusa i3 in a sense are all the same printer, just wit slight modifications. Replacement parts are very easy to get hold of, or even make yourself. Alot of people buy a printer and the printer their own parts to upgrade the same printer. Generally if alot of people are saying bad things about a product, then it speaks for itself. Sometimes some people have a bad experience with a certain product, doesn't make the product bad. Only way to know is to try it yourself. If you are worried though, make sure the manufacturer/supplier gives you some kind of guarantee for bad parts, just to safe guard yourself.