In reply to rick:
Depends how hot you run. For a lot of people, Paramo's fine. I run very hot anyway, so the fact that the shells are thicker than normal means that if you run hot anyway, you'll sweat buckets in Paramo. I did some gear testing for them earlier this year. wearing one of their reverisble shirts as a base layer, as recommended, the only time I didn't feel overheated in the jacket was when doing hardly any "work" at all, when the weather was cold (ie, around minus 5, plus cold breeze, no pack, strolling gently on Ashdown Forest with little elevation change.
At zero, going slightly uphill with a day sack on, I was overheating. Bear in mind that if going up to, say, Stob Coire nan Lochan from Glencoe, in minus 5 with a winter climbing sack on and a rope, I'd happily walk up in a short sleeve thin ACL base layer and still be warm, just sticking my shell layer on if we stopped.
Horses for courses. There's no "one-solution-fits-all".