Those European brands can be amazing, if you hit on the right one. I bought Jungle Juice at Prowler in London a few years back and it was really incredible stuff. I tried some from a store in Paris and it didn't do anything, even though it was marked as "amyl". Then I went back to Prowler last year, bought the same exact bottle of JJ and it had no effect at all besides a headache. The bottle I had in my freezer is Double Scorpio. It's pretty good.