Does it Work? - Goji berries

hi guys whats the crack with Goji berries? apart from being really expensive do they actually do everything the hype suggests?

they are very tastey but with them costing about £36 per kilo is it worth it.

I've never heard of them so I'm not sure what the hype is but wikipedia has a good overview of them and their properties.

http://en.wikipedia.org/wiki/Wolfberry

Ive never heard of them either.. what are they supposed to do?