Ken I.wrote a review of MontBell Ultralight Down Jacket - Men's on January 24, 2013
Familiarity: I've put it through the wringer
pros: very light, packs down super small, great for insulation on day hikes.
cons: not warm enough for nights camping in fall; definitely inadequate <30f; low fill wt - only 2oz - so though it is 800 fill, there is not enough of it to give adequate loft. my marmot wind shirt is way warm and still my mid layer for ice climbing.
only get this jacket if using when >30f