I use sleep all the time. But tested against complete shutdown too, and the battery indeed last longer (2 weeks vs 2 weeks plus 3 days)
I also found letting it sleep without using it also consumes battery, I once left mine 1 bar and not using it for 3 or four days and found the battery was drained when I was going to use it. Take note however, I have not yet tested this on complete shutdown.
So extra 3 days for my kind of usage is not that much of a difference I think, so I'll just sleep it all the time. If you are going for a 3 or more days without your reader I think it'll be better to shut it down.
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