AVOID ROCKDOOR! I have had two black front doors from RockDoor through GX Home Improvements in Chalfont (including a replacement slab). Both have developed a serious issue, where a panel has expanded in the sun, and 'popped' to create a very large and unsightly 'bubble in the middle of the door'. GX want to charge me to fit a another replacement slab. Rock Door have shown absolutely no interest. I spoke to their Customer Services Manager Joanne who failed to understand the needs of her end customers. No support. No interest in their faulty product lines. GX no longer stock RockDoor, presumably because mine is not an isolated case.