Makeup query?! Urban Decay product vs Benefit product?!?

I really want to get a product for my eyebrows (very blonde....! lol) so that...er.... you can see them better! Benefit have a product called 'Brow Zings' which i could get for �20, but Urban Decay have brought one out called 'Brow Box' which is �15. I don't just want to go for the urban decay just because it's cheaper, but could anyone who has ever used either or even both of these products tell me what they think of them, and which they reckon i should go for? Thanks!