Rating: 5 / 5
I like the new "light synthetics" like Polarguard Delta and Primaloft because they are much more "washing machine" friendly than down. I know people who put up with a LOT of grime on down jackets rather than deal with washing then unclumping and drying them.
As to the Micropuff Pullover itself, although I suffer from a residual "Patagucci" resentment, I have to admit their design, materials, and workmanship make me drool - and when applied to "ultralight" gear seems to turn out some really remarkable pieces, like this one.
I also have the Micropuff Vest, and that is a 6 ounce or so wonder too - even uses nice lightweight plastic snaps to save on the weight of a zipper. Love to wear it under the Micropuff pullover to bed. Doubles up the insulation over the torso, and gives me layering opportunities, vs. a single heavy parka.