My Rollerdor RD77 garage door is 6 years old. It's had very little use as the door is only opened to get my bikes out - my van is too tall to go into the garage. In 5 years it's been cycled around 3x per week = approx 600 operations. It's not used every day. The door has never worked. Despite several visits by engineers, I've never been able to just press the button then drive off, knowing the garage is secure. The door would half-close, then re-open, or just not close and beep. The safety edge has been replaced, more visits, including replacing the curtain drum bar as well, but no good - I just got used to holding the remote button down to open and close. The re-programming instructions for the control unit are unusable and should be re-written. You can't re-programme the unit by following the instructions because they aren't precise or clear enough. Now I've been advised that several of the upper curtain slats need to be replaced. They have slid off the guide wheels and been damaged / gouged by them (see pictures). The door also gives out 3-4 piercing squeaks upon each open / close. Something is also scratching the inside of the slats (see picture) across the whole door, making it look unsightly. Rollerdor have offered a discounted price to replace the slats, but I have no confidence the door will work as it should, so I'm just going to replace the whole thing with one from another manufacturer - why spend good money after bad ?