I've bought the T&W one twice since Sunday and on both occasions the driver has had no issue. The first one confirmed it was the £6 one I wanted, but the second one put it through straight away.

I haven't on this launch, but generally if there's a ticket that is new or that I don't buy often I'll also specify the price just so the driver knows what I'm talking about. Given the amount of tickets they have to sell, and that everyone seems to call them slightly different things, I think stating the price eliminates any potential confusion.