At check in it is a bit of a lottery as Speedy Boarders think they are entitled to use the Speedy Boarder Plus check in desk. This is annoying as they take as much time to find out that they are in the wrong queue than they would to check in so are often allowed to do so.
And maybe if there wasn't such a variation of terms used by the different airports people may not be quite so confused. At some airports I can use SB plus, at others a dedicated SB desk and at others there's no check in/bag drop benefit at all.
I wish when I was travelling all I had to worry about was whether mere 'Speedy Boarders' were in my 'Speedy Boarder Plus' queue.