Lets try this different glass thing, I always use Glencairn because thats what I have.
15 in a Glencairn, big nose, lots going on, sweet and tasty
15 in a tumbler, nothing on the nose, lost in all that air?
Palate and finish remain the same I think, but you do loose all that nosing experience with a tumbler, which to me is half the enjoyment. (And yes friends always give me a funny look as I try and nose everything from wine to a pint of stella, coffee to a can of coke

