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@droupou I've seen pictures and heard stories as well and so have never used one myself assuming the correct bear hang will always be better.  You're supposed to couple the sack with odor proof bags and I wonder if people do this all the time.  In addition, I can imagine if the plastic is compromised without someone realizing it or the outside of the plastic or ursack is dirty with food, it probably doesn't work as well!  I have hiked in areas where bears are not much of a concern, but where small critters are way worse and seem to get into anything!  In this case hanging an ursack or ratsack may be better!