I had never had it when it came out, as I was 2 years old. ;)
But me and my friends managed to aquire a bottle that had been kept for a few years.
It was a little flat (Obviously), but it tasted great. It had yellowed a little as well, but that's due to the sugar or caffeine or something.
I really would love for it to make a come-back. It was, like I said before, Great stuff.
I think I have a 'Bring back Crystal Pepsi' T-shirt. I'll need to find it...