Make sure you give them an email that has good spam filters. Last time I signed up for something like that, I suddenly started getting 1000+ spam messages a week.
Is it legit? Just an e-mail address and you get two years free?
They actually want your information. Not just an email, you need to fill out your info but you don't need to fill out actual info. In exchange, they got your info and you got magazine plus some junk mails. I'm still getting windows game magazines, PC magazine, etc..