I owned the Gore Cosmo jacket (
Wiggle Link) up until a couple of weeks ago - when the stitching started coming undone around the cuffs. For an expensive jacket - this wasn't really on, so I took it back.
Few comments about the Gore - the arms aren't breathable at all, and although it has armpit zips, they just don't provide good enough ventilation. There's also barely any ventilation around the bottom of the back. The pocket in the back is pretty OK, but isn't great, and there's only one.
The jacket is definitely wind proof and did water-resistant OK - I found that up until ~90 minutes into a ride in a reasonable rain shower you were dry, after that, water started to soak up the arms through the cuffs.
As the poster above me says, the Gore stuff is fairly baggy - I took a small in the Cosmo jacket and it was fairly flush, but not very "grippy". The hem tightening isn't very convenient.
The Gore is a nice jacket, but I just didn't find that it worked with how I was riding, so after I returned it, I got the Assos Airjack 851. First off, it's a completely different fit to the Gore, feels a lot more like a jersey than a jacket.
I found that it's much more breathable around the back (having a lycra back, and back of arms) meaning that my temperature feels a lot more regulated. The hem at the bottom is elasticated, so it stays down nicely. The pockets at the back are really just as you'd expect on a jersey.
Today, it rained whilst I was wearing the Assos - it's good for water resistance where the windproof fabric is. I rode for ~1hr in the rain, and then got caught in a massive downpour with it on. I found that it was about the same as the Gore in terms of water-resistance.
It's definitely a slimmer fit though - so if you don't like figure-hugging clothing then it's probably not the best.
I'd say that's definitely worth the extra ~£20 over the Gore though.
