In reply to macleod92:
In contrast to everything written above……
I think down is fantastic. It copes with the damp fine in my experience, especially the new hydrophobic stuff, lasts a lot longer than synthetic, is a lot warmer for its weight, breathes better than a synthetic, isn’t as clammy and nothing beats the snuggly warm feel of a down jacket.
It is rare in the UK for it to be cold enough to need a synthetic or down whilst active (or maybe that’s because I’m a big sweaty mess 90% of the time*), you are going to want them for when you aren’t moving. The synthetics win in a grim wet winter hoolie to drag over everything nut if I’m rock climbing, it’s probably not raining so I’ll take down.
I have far too many jackets and nine times out of ten, I’ll reach for the down.
*also potentially the new “active insulations, Fullrange, Alpha etc can be worn on the move but they are a different kettle of fish.