Had these last week, all really nice beers.
I like my IPAs nice and sharp, so for me Nelson Sauvin was the pick of the litter.
The Sorachi Ace was really defined however, and I'd agree with Brewdog in that it's quite reminiscent of bubblegum.
The Citra flavour was great but it seemed to be the least balanced of all the beers.
As for the Brambling Cross, I thought it was a bit tame, though maybe I was expecting something more extreme after trying the others.