Really don't like the idea of having two different, BD mystery boxes. £80 is a lot of money to pay for something completely unknown, especially at this time of year. A lot of people will probably only be able to afford (or can only justify) buying one. Before, you bought the mystery box, and if you got something you weren't super interested in, that was always going to happen.
But now this is a situation where you can buy a mystery box, get something you didn't want, but can also miss out on something you did want, because you bought the "wrong" box.