I traded my Montbell Alpine Light parka to a member for his Roan Plateau and have been pleased so far this winter. I have no idea what your definition of "fairly warm" is, but I'll take a stab.
I'm 6', 175lbs. and the Roan in size medium fits me very well all around. The cut is slightly longer in the rear, which is what I needed and didn't have with the Alpine Light (* I roughly have a 19"-20" torso). Hood design on the Roan is simple and warm, on par with other down parkas I've owned in the past. Hidden toggles in the hood take in volume from the hood when you need to batten down the hatches and can be done with gloves on. The weight on the Roan could be better, it's a bit portly around 18oz., but provides ample warmth while stationary down into the twenties in my experience with a light base and midlayer underneath.
Obvious areas where Golite could have shed weight are in the zippers and in the collar area. They used a microfleece lining on the collar, which is comfortable, but does increase weight. Two interior pockets are useless for me, but could be handy for gloves, flask, headlamp, etc.
As far as the specs go, Golite doesn't list the fill amount, but I remember Richard Nisley posting in the forums that the Golite had a little over 5oz. of down.
Quality? The Roan is running $119 at Golite right now. Personally, at that price, who cares as long as it works and holds up to the use you inflict on it. I'd say the quality is good, not great. You could easily pay twice as much for comparable warmth and quality.