Just a wee update on this – ended up getting myself one as well and i have to say ive been very impressed so far.
Have worn it with arm warmers in temperatures ranging from 2 to 10 degrees with a long sleeve base layer. Its been really good – not bulky so no flapping about and although its a bit cool if standing about it is just right when riding and doesnt get too hot when climbing.
Good for a bit of rain and showers – if it was going to be raining the whole ride then i’d go with a waterproof instead. Also it could do with a zip pocket for phone / keys.
Anyway for once the hype about a product seems to be worth it!