The only problems I have encountered were a direct result of my own experimenting or incorrect usage. One of the photos in a negative review by another buyer show clearly that the machine was not even assembled correctly before use! It's the buyer's responsibility to get at least the basic setup right before coming here and bashing the machine, manufacturer, or any other party involved with the distribution and sales.My machine arrived safe, in one piece, and looking as good as one could hope for. Operation is simple and smooth. If you do what you are supposed to do with it, you shouldn't have any problems, assuming you didn't get a faulty machine in the first place.The resulting buttons as a whole depend on the materials you use, how you handle the machine, and whether or not you know any tricks to get exactly what you want out of it. Overall, I recommend it to anyone wanting an affordable, easy-in, assuming you can follow basic setup instructions.