The bodywarmer they do (Bise, ISTR) has been the best bit of clothing I've ever bought. Takes up next to no room in the pack, pop it on at the end of a ride while waiting for a train or having a pint as the temps drop. Or for an early morning start when you know it's going to warm up later and don't want to lug a jacket around.
Now I'm looking at jackets, what I'd really like is my bodywarmer but with arms and a hood. The Sastruga costs a fortune though, is it worth the money? Could save about 100 quid by getting something similar from Decathlon.