Been out on the SWCP at the end of July and was happy with the Oscar.
Used it with a silk liner and I was suitably warm on cliffs and more sheltered camps.
I used an akto and a thermalite mat, so no draft issues.
I'm out walking again in September so I'll see again how it shapes up then.
But so far I am happy with the Oscar - i should add the rider that I have an aversion to down bags, by virtue of a bad experience in my teens. Hence I have a Lamina 0 for the winter.
I still have a Point Five Bedouin three-season (also synthetic) bag, that has finally given up the ghost because the pull cord has ripped its containing material. It was a quality bag that I bought decades ago and has served me well. Perhaps that shows that buying quality equipment is the best option.
After my initial apprehension - at seeing the bag packed so small at the shop and me having paid a few quid for it - I was happy with it.
Got me thinking about how two of these bags put together inside one another would perform in colder climes, being a total weight for the two of 1kg. But as a single plus 5 is about right. Keeping the wind chill down helps, and had I been really cold I would have stuck the feet in the rucksack and adorned myself with more layers. In praise of the bag, it surprised me because it felt warmer than its weight would appear to justify - the measure being the mindset that says heavy is warm. The tag of three-season might be pushing it - three -season on the SWCP fine, but maybe not on a wild windswept pitch above Burnmoor Tarn in early March, if that qualifies for three season.
I need to take it out more this summer and test it at higher temperatures, but I am happy with the Oscar. It'll be interesting to see how it gets on in late September and into October, once it has been used a bit - ie squashed, packed and perspired upon. I was beguiled by it because of its weight and because it is made by Nordisk and I have an inkling that it is a little gem.
I use layers to keep warm/cool when walking. Maybe that's the way to follow for my sleeping gear.
It's late, I am doing the kind of rambling that comes of tiredness not from following an OS map.