In reply to Taxboy:
I’ve recently got the Trango for a trip to the Himalayas, and have previously owned an older version of the Lightline.
The Trango is definitely warmer due to the internal baffling design covering the stitch-through, a more technical jacket (slimmer cut) and slightly lighter. The Lightline was a decent jacket too and will do the job, but I would say it is aimed as much at the ‘about town’ market as it is at cold weather mountaineers. I wasn’t a fan of the detachable hood either, if you’re taking it on an expedition.
I’ve had a large in both and they fit well. I’m 6’2”, 13.5 stone, 42 inch chest and 34 inch waist. They are both over layering/outer layer jackets- I couldn’t get a waterproof over either of them although, if it’s raining, you wouldn’t be wearing either of them.
It really depends what you want to use it for, I guess.