I believe the SP pro/star machines are relatively new products compared to the tennis tutor. So, I'm wondering about long term feedback from users who have owned one after a year? i'm concerned about 1. durability: has anything broken? 2. maintenance: is it a pain? what needs to be done if you were to use the machine 1-2 times per week? 3. satisfaction level after 1 year and outlook? the value just seems real good compared to a tennis tutor and I have heard virtually very little complaints about the tennis tutor, while you don't hear much about the silent partner (other than someone just bought it recently and is excited).