I returned mine (two years, but only about three outings later) to MEC. It didn't breath anywhere near well enough, so it was like wearing a lightly fleeced, slightly strechy, non-sliding Goretex shell, with no pitzips, that wasn't waterproof.
I swapped for a MEC Feratta top with a hood. This is a great top for climbing and possibly rogaining, and SAR, when you need a jacket to plough through scrub. Very breathable, stretchy, fairly windproof, fitted. But for a LW system, I think you're better off with a base layer and a windproof. More versatile, probably lighter, durable enough for most on and off track walking (not Tassie though)