I've now had the 'opportunity' to try the Dipole 1 DW in some windier conditions; it is useful to gain some experience of setup in more difficult real-world conditions. The structure handles the wind very well, I certainly agree that it is as good as the StratoSpire.
I used the guylines on the top of the struts and trekking pole apexes - they do no more than help prevent the poles and struts being pushed in by the wind.
Guylines removed in the morning after wind had subsided:
View attachment 56505
In the wind it is a little more difficult to stake out a perfect rectangle, as the buffeting means it is more tricky to feel the centre tension point as shown in the pitching video.
The end struts can be held very tightly in position when the tent is pitched, so some care may need to be taken if their position needs to be adjusted (eg to inset the lower end of the pole appropriately). On rough heathery ground it can be difficult to move the base of the strut past woody stems or roots, in which case it is best to release some tension, move the strut and re-tension. I've not had any issues with the strut sinking into soft ground, but I wonder if there are situations where it might be useful to place a small cap over the strut end to prevent sinking into the ground and also make it easier to adjust the position.