Brett
The Scarp is 218cm long, all of it is usable. Even on a thick mat (7cm) you still have space on top of your face right at the end. The minimum height is 38cm, so for every cm short of 218 you gain some head room...( the apex of the inner is 99 cm)
See
http://www.tarptent.com/scarp1.html, look also at the cutaway dimensions page. Those figures are accurate.
This picture shows an Ultralite on top of a fully inflated Exped 7 , that "pillow pump" is about at the height of my face because is sitting on top of the fully puffed up bag that what would be otherwise compressed down if my head was there.
Note that I have the pack inside beside the mat .
A major reason for condensation with some designs is that they do not promote air flow, either by not allowing air in from the bottom or not having a vent at the top. Some incorporate both "features" . One point to consider is that people that like their tents will minimise the problems (either by finding a fix or glossing over ) the ones that don't like a shelter will maximise those "problems" so often is hard to get a balanced view.
Franco