I have to preface that I this type FB since RD. 3 years use. Overall, I have three in operation. If you caught any Monday-production, the product is highly recommended. Easy to prgrammieren, good manual, understandable to laymen. Unfortunately my experience that the quality spread is very large. Time after the 2-year warranty was the only FB in the knee and a new one had to be ordered. The new supply was not working properly and had consequently be equal swapped again. The subsequent delivery funzt again properly. Perhaps simply due to the low price? But since I'm not ready for a FB to invest a high amount must and can I live with the shortcomings. A word to the support of the manufacturer: Great Cataclysm! Although you get a confirmation email that the complaint is received and processed in 5 working days, then you can hear but nothing more. Not nice!