I have a friend who uses a 20+ year old SD 20F* rated down SB. It has always been storred compressed. Once a year usually in spring he takes it out tosses it in the dryer on "no heat" setting for 30 or so with half a dozen tennis balls. It fluffs right back to full loft everytime.
I've mentioned to him about storing it un compressed and saving the down's loftiness, but, he swears that's a myth. He has been doing his down this way for 20+ years and is still satisfied with the results.
Personally, I store mine in the storage bags that came with them. I don't usually compress them until the night before my trip, and usually it's the first thing I unpack when I get home. However, I have left mine compressed for several days at a time with no apparent I'll effects.
YMMV
-A.A.
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