Our 5 Bear Vaults (3 large, two half-sized) were tossed around by Yogi on two of our nights at Clark Lakes this year. Being several hundred feet away, we didn't hear anything, and it was apparent that the bear just pretty much verified what they were and then moved on (to the large Sierra Club encampment, as a matter of fact). We store them all together and are confident in their effective protection of our food.
Unfortunately, Yogi didn't just bite my reflectix bag like last time, but tore it and the new companion bag up a bit. Duct tape to the rescue, but I had to use my whole stash. Dumb mistake to leave them in the "kitchen".
Yogi didn't visit us at all up at Thousand Island Lake, because he had several campsites in the "tourist zone" closer to the north end of the lake to pick from. The mountaineers camped south of us for Ritter/Banner were like us: no visits.
However, during the prolonged rains up at Thousand Island Lake, our BV's did take on water but we think it was due to us having lids off to get at food during the storms. You go as fast as you can but... Anyway, with everything, including trash, contained within Ziplocs, the water caused no trouble and dried right out in those epic, sunny mornings that followed the storms.
I know the BV's aren't "waterproof sealed", but I have dunked and rolled one in Badger Lake to wash off bear slobber and such, with no leakage into the canister. The tradeoff here may be that, if one cinches the BV lid tight enough to hold out water, it might be a...bear to spin it loose, later on.
The weight and size of the canisters is a bummer, but they work and work well.