We have a really old and plenty of well-worn deck of cards, however, on which we depend of tradition and the special printing very. Therefore, we were skeptical whether the machine it is really suitable. After initial difficulties with the adhesion of the cards to the transport rollers, it went from time to time better. Now it's perfect and makes great fun. It is perhaps wise to initially wipe the rollers with Spüli or vinegar to remove any production-related films / coating. For children certainly makes sense to train the motor sensibility. The testing of the proper speed (if too slow, the cards fall vertically and jam), the expenditure of force, recognizing and decide when it's better to turn back to eliminate blockages. Also recommended for people with limited dexterity. As already described by others - we tear ourselves about who should mix. The crank functioning properly - you slip nor will cancel it. However, since the device is made of plastic, they should also deal with it accordingly. Misused and excessive force effects it will surely not withstand. Addendum: After about 3 months, the crank is now but canceled. Although we are not really gruff handled it. Too Bad. Otherwise, it was a very good device.