One opinion and two pieces of evidence.

Opinion - a season's storage of a Zinfandel did not seem to
detrimentally affect the wine. There was no side-by-side conparison,
so that's why it's an opinion, not fact.

Evidence 1 - Because it's plastic, it's a lot safer to move wine in a
Better Bottle. Less likely to crack and spill the container, and the
container is a lot lighter.

Evidence 2 - Because it's plastic, the sides aren't as rigid and
therefore you get a lot more sloshing of the wine when moving the
containers about as well as more change in volume with temperature
changes. This *might* lead to more aeration and oxygen-introduction to
the wine.

It's all I got, and probably less than you need.

Rob