The drive motor is the weak point

I have the 9700 for years in my application and I'm not really unhappy. They perform daily reliable service. Over the course of 8 years, but three of them have so far failed. Each time the drive motor failed. The failure was heralded in all devices by a deteriorating end, irregular running noise for months at time. This purchase is a spare parts inventory for the neighbor who will turn determined. My blinds are loose within the permissible load range of equipment, the drives of the most serious blinds have not failed first. So with the life of the equipment I'm not completely satisfied, so it is not enough for four stars ". The operation and programming is not difficult. A brightness sensor (not included) is a useful addition. Why is the astro function only to close are blinds, I never understood that it will now also be in the follow-up devices for opening, for the more no clock and the up / down keys are left / right (... how to come to such an idea? ).
Conclusion: It is difficult to find anything better on the market - that is the problem! Maybe yes Rademacher succeed in the future one way or another improvement. Then the devices were really good!