Door fitted quickly and works well. Minor issues that I would have addressed if I had been available to inspect the work before the engineer left suggest that its basically good and at a decent price but could have been a bit better in terms of finishing off the details: (1) Wiring to the nearest plug was messy. (2) large (2cms) draft gaps at the top of the unit needed filling with a bit of wood to complete weather sealing. (3) the gap around the vertical edge of the side fittings was left open so I had to fill it with sealant myself, again a bit of important finishing to effect a draft proof seal. These little points sound picky but I had expected a bit more finishing the job to have been included but for the price I am a happy customer with the work done and now its finished I would recommended them to others with the caveat to be ready to supervise the finish or be ready to do a bit of draft proofing at the end yourself. As it was significantly cheaper than a comparable system a neighbor bought from another company I am happy about the end result.