The Westmark Pflaumenentsteiner is not much bigger than a kitchen knife, so quite small and compact, which is why I think this is important because such a device about eleven months of the year is usually unused in the closet. It is more of a special kitchen knife. One should thus put into the device, that the knife stab about in the tubulation of plum while stoning the plum. The four very sharp knife then press the plum stone out without too much effort. The works usually very reliable, but sometimes (perhaps at a 10 plums), the stones twisted in transverse position, so that it no longer fits through the hole, and you have to start again. Inserting and removing the plum goes quickly. The I rate as good work results. On one side of the plum is intersected by a slightly larger diameter throughout, so you can easily open the plum to control the interior to "residents". The material is die-cast aluminum, and the blades are made of steel, so the stoner makes a durable impression. Sure, we could give him in the dishwasher, but I would advise against it in order to keep the blades sharp as long as possible, and the rinse water might damage the composite bodies of the knife. Since the knives are so free and are of no plastic housing. is the cleaning and so easy to do.
I do not want you but also deprive potential drawbacks: As a small drawback I see that one should this unit due to the very sharp exposed blades not necessarily give in little hands, so that the child unfortunately this may not help in the kitchen, and have to watch. There would be a standalone unit with housing, where the knives are not exposed, probably safer. Furthermore: The plastic ring that holds the forceps during storage is not fixed on the unit, and goes so quickly lost. Here I would like to see a better blocking solution, as it is known from other pliers or scissors. The knife itself in the folded state are still free. A plastic case for safe storage would be handy.
All in all, it is a practical and reasonably priced product.