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Rather peeved I emailed them and quickly received a reply saying that only US credit cards supported AVS and so only US credit cards would be accepted.
They did however post over 2 trial copies for me to check out, with the offer of sending me a pro-forma invoice should I wish to subscribe.
The issues I received were interesting enough although nothing ground breaking. I'd say they're more useful as a barometer of the affiliate market than anything else, e.g. general trends, what's hot, who's advertising etc.
Did I want to subscribe, yes, but not enough to go to my local bank, queue for 30 minutes at a forex counter for a US cheque, write a letter, walk to a postbox etc etc.
Net result for Revenue, one less subscriber. Ahhh well.