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I've been wearing my Nano Puff for 4 years now, and it has served me well. The Primaloft One insulation is about as good as you can get with synthetics. It works great as an outer layer in spring/fall, or as a midlayer for winter. As Patagonia intended, the jacket is very light, packable, and warm for its weight. The only hole I've had in it was from campfire sparks, not abrasion. Both the lining and outer materials slide well over or under layers. Breathability is not great, which can be expected from a polyester insulated jacket, so my Nano Puff usually gets use as a midlayer in either low-output activities or bitter cold days. Overall: great piece that I expect to be using for many years to come.