They call it Super Sour Plum flavour. In fact that is exactly what it is, they have perfected the flavouring and it is exactly like a sour plum, whether you want that in a crisp is a different matter.
When you first put them to your tongue, you could be forgiven for thinking that they were prawn cocktail, as they can have a cherry tomato tang to begin. Then the sourness hits you and you realise how plummy they really are. Surprisingly they don't smell of anything. The actual crisp is good, nice thickness with a good amount of crunch and the right amount of oil. Only thing is that the flavouring makes them look pink. (is that a good thing?)
I think if you're a fan of prawn cocktail (and I know a lot of people aren't) then I think you'll like these. They are an extreme variation but not disgustingly so.