They've put out three issues so far (this article is from the second issue - next is Alan Turing) and I can honestly say I'm very happy that I bought a subscription. It's well worth a look.
Yearly subscriptions start from £38 (digital), which we think is pretty good considering how much we pack into each issue (take a look here for the contents list of issue 3: http://www.linuxvoice.com/issue-3-is-out/).
Print subs are obviously more expensive, mostly due to the cost of postage.
I had a quick flick through to the third issue to get a rough estimate of how many pages of ads there were and...erm, I couldn't find any except an EFF ad on the inside cover. I don't know if that means they're struggling to find advertisers until they're more established but frankly I'm happy to pay a bit more to have more content pages, given the choice.