Only placed my order a couple of days ago so quite surprised to receive an email for a review so soon. I followed their measuring guide which was simple enough and submitted my own measurements. The calculator is great. You just put in your sizes and select the optional extras you require and the exact price is immediately generated. I managed to save around £250 on quotes I was given by local companies. Also, they manufacture in the UK and the local company's supplied doors manufactured in Germany and quoted around 12 weeks for the installation which I thought was ridiculous. I did have a couple of queries before placing the order which was promptly answered on the webchat. So far so good. I will do another review after the installation.