Just got back from my first trip using a Scarp 1 for a week in WA's Stirling Range. I camped on the top of 4 mountains in a variety of exposed positions.
After many years of carrying an Olympus the much lighter weight of the Scarp 1 was much appreciated on the steep climbs. For a single person I found the floorspace was adequate to fit all of my gear inside the tent (rather than having to leave some in the vestibules). It is a shame that the tiny internal storage pocket isn't significantly bigger so that you can keep more stuff off the floor (it's just big enough to hold a couple of small mobile phones). But I guess that is the price of the low tent weight.
In some pretty windy conditions I found the tent stood up well so long as you could peg it down properly. Even without the optional crossing poles it didn't feel like it would collapse. However, if you are forced to camp on rock shelves you'll need to find some pretty heavy rocks to hold the tent in shape in windy conditions.
Set up is fairly quick once you get used to it. The supplied pegs are okay for use in soft ground but I also carry some different thinner sorts of pegs that are better suited for harder ground.
I didn't find the floor of the tent to be too slippery for my sleeping mat to stay put, so long as you avoid steeply sloping sites.
I didn't have any rain during my trip but did experience some cold nights. The outside of the fly got covered in heavy dew (as all tents do) but very pleasingly there was none on the inside of the fly or on the inner tent. So a credit to the ventilation. And if you seam seal the fly competently it is very waterproof.
On the downside though, in windy conditions due to the light fly fabric weight and being a single hoop design I found that this tent is very noisy. Don't forget your earplugs if you want to get a good night's sleep as on some night's I only got 3-4 hours sleep.
The Olympus isn't retired (or for sale) but the Scarp 1 will be my choice of tent for 5 day plus walks from now on.
Overall I'm pretty happy with the Scarp 1 (it is far better and lighter than my ancient Eureka 1 man tent which I can now throw out) and look forward to more field testing in Tassie next year.