I have a boatload of these types of tins cellared and so far (knock on wood) I haven't had a single problem with any of them save from the old tin of Old Joe Krantz that was so pressurized that the top went boom when I went to open it. Thought I was going to die. Fun times.
Funny story though, I did pop a tin of Irish Flake some years ago that had a defective seal. The tobacco on the inside was fine but I think that was a fairly fresh tin. Like most things in life, quality control for this sort of thing can only go so far, and I think that if this was a genuine issue in manufacturing, than most of the companies who produce at any kind of volume should be made aware of the problem and I'm willing to be that they will make things right.
Funny story though, I did pop a tin of Irish Flake some years ago that had a defective seal. The tobacco on the inside was fine but I think that was a fairly fresh tin. Like most things in life, quality control for this sort of thing can only go so far, and I think that if this was a genuine issue in manufacturing, than most of the companies who produce at any kind of volume should be made aware of the problem and I'm willing to be that they will make things right.