Although I have never tried a drink that's just cucumber, I have tried cucumber gin which was light and refreshing, so thinking this might be too!
On opening it it smells like I've just cut a cucumber in half and taken a big sniff of it, very cucumbery (not surprisingly)
As for the taste of it, well...It's really lovely! It's quite sweet and fizzy with a taste that's strong enough to be able to tell it's cucumber, while not being too overpowering.
This would be a wonderful summer drink, on its own or as a mixer with vodka or gin. I would recommend this and I plan to get it again when the weather improves for some summer cocktails, yum!