The ordering process was straightforward and the sizes were correct. I ordered a frame and mount for a large (20" x 30") picture and the measurements need to be quite accuracte for this as any error is quite obvious. The picture only just fitted within the border mount so I would suggest allowing another couple of mm. The acrylic material seems to attract the dust and other particles when assembling so it was difficult to get a good clean assembly. I tried a microfibre cloth and vacuum cleaner but it is very difficult to get completely clean ! I think glass would provide a better result.The smaller picture was much easier to handle though. The frame construction was adequate but the larger frame (costing >£60) seemed a little on the 'lightweight' side compared to what I was expecting. I guess the acrylic and lightweight frames make it safer and cheaper to send through the post so it is a reasonable compromise.