I read all that stuff, but I wanted insider info seeing as how we have lots of Scots and Brits on the forums.
It's Irn Bru, Scotland's other national drink.
It doesn't taste of any fruit (in the way that Fanta is orange). It is more sugary than most soft drinks. I love it with a passion. I'd love to describe it more, and taste it, but I can't get any bloody Bru in this stupid city.
When McDonalds first opened up in Scotland, they didn't have Irn Bru for sale. McD's was boycotted by a large number of Scottish people until they took it in.
Irn Bru is (most of the time, although it's a close-run thing with Coke) Scotland's best selling national drink, making it one of a few countries where neither Coke nor Pepsi are the #1
I believe it's illegal in the US due to one food colouring or additive.
On that note, if spilt it's very difficult to get out of clothes - it is bright orange in colour.
There is also diet Irn Bru (low sugar) and Irn Bru 32 - an energy drink version. You can get it in a mixer with vodka, and irn bru and tequila is a favourite combination of a friend (with gold tequila, the colours match, you see).
Irn Bru also do fantastic TV ads - see
here,
here,
here,
here,
here and especially
here.