I've had a BV350/400 for about a year... the lid sometimes screws off without needing the tab pressed in. I emailed about getting just a new lid, and they asked for my address. I was expecting to pay a small amount but I guess they're going to replace it.

I've used my canister in Yosemite and Sequoia, and a few times in other wilderness areas, and strange to say it's never been played with (knock on wood). We are going up to Thousand Island Lake in a week so I am renting a Bearikade. I hear the bears are pretty bad up there.