I have just had Diamond electric garage door fitted, all things seemed to ok but its early days yet regarding this product, it works very well smooth movements in its operation, nice with an included alarm fitted which other companies request an extra in their prices, there are a couple off items could make for a better job a little make good to internal brickwork and mastic to inside off frame would have rounded it off, this I completed myself but not a real problem, externally the appearance looks very professional and clean job, felt confidante with the guys and the installation, so quite please with outcome. Mr Dawson Stevenage