Dear Affinity. I agree with all the posts so far - a great product but a gaping hole where the Dimension tool should be!!
Please Please Please can we have a dimension tool. You already display dimensions when hovering the mouse over and between shapes, so we know at least some of the functionality is already in the code! (although I appreciate, as a software dev it's not quite that simple!)
This is the one missing feature that really kills Designer for me. I mean come on, even the name 'Designer' implies 'Designing' things and designing things usually requires dimensions!!