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The main complaints with the V29 is how hard you have to blow to make it loud. You don't need to blow the D2 nearly has hard to get a comparable volume (about 120-130 db on how you measure it). Of course the sound profile and pitch are very different between the whistles and everyone has their own personal preferences and needs, so there is no better whistle. Except for the Better Whistle. (-‿-)

Better Whistle