This brings to mind the expression, "Are you gonna believe me, or your 
lyin' eyes?"
I have the Vacu vin(w/canister) and have been using it for at least a year. 
It seems to vary as to how long it can hold a vacuum. I've had it lose it 
in a couple of hours and I've had it hold for a week. I know there's still 
a vacuum because it makes that "woosh" sound when I pinch the stopper together.
Perhaps the model for the wine bottles doesn't work as well because of the 
seal, or lack thereof, but the canister model works as advertised.
A tip: Sometimes it helps to make sure no grounds have gotten on the rubber 
seal. I usually wipe the seal and the interior of the canister with a 
dampened paper towel before I draw the air out..
Ciao,
Angelo
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