I own the previous version of this parka: the MH Sub Zero SL. My climbing partner owns this newer Glacier Guide version. I decided to compare the two. Initial thoughts:
-The GG is far less lofty. The Sub Zero seems to have much more down filling and is therefore warmer. The hood on the Sub Zero has significantly more poof to it.
-The GG Parka does have superior front pocketses, the two chest pockets and Nalgene holder on the inside are primo.
-The GG is cut much longer. My Sub Zero does not extend down as far around the waist cuff.
-The inner zipper baffle on the GG has a strip of protectant grosgrain ribbon sewn onto it. the Velcro on the outer zipper cover flap tends to stick to this and get caught. An annoyance when you're in the alpine.
The previous versions, the Sub Zero SL and the similar Chillwave are much warmer with more loft and better hoods. The Glacier Guide Parka may have slightly better features but does not compare in terms of loft warmth. What this jacket does have going for it is durability. It will last forever. However if weight and packability for better warmth is your thing, I suggest getting the MH Hooded Phantom Parka. With 850FP down, a fixed hood, and box baffle (Not sewn through) construction, weighting about 17 oz, It blows the Glacier Guide out of the water. It has a comparable price point as well when it goes on sale.