Hey David. Thanks for the quick name update. It's always appreciated.
It's always 'buyer beware', but Whizlabs are a pretty reputable bunch, and have a decent reputation in our industry, so I don't think they're out swindle anyone.
I do believe that vouchers are only valid in certain geographic regions, so one bough in the US might not be honoured in Europe or Asia. That's the only thing I might be concerned with.
Good luck! And check out my signature links for some good
SCJA info, along with the SCJA FAQ at JavaRanch.
Good luck!
-Cameron McKenzie