Something to keep in mind - subscribing to Block isn't like subscribing to other magazines. You don't pay $$ up front for a year's worth of magazines, they bill you the individual price when they ship them out. So you can 'subscribe', get one, check it out, and cancel your subscription if you don't like it.
I just called to find out how to switch my paper copy subscription to ebook, and the woman told me to just cancel my subscription and buy the ebooks when they're available (they don't have a subscription service for the ebooks yet, you just buy them individually).
My problem is the Block is too nice! To avoid having 300,000 quilt magazines piling up, I make a point of, after a few weeks of browsing it, going through the magazine and ripping out what appeals to me so I can throw away the rest. I couldn't possibly do that with Block! It's like a book! And then it will be 2 books, and then 6, and then I'll have 300,000 Blocks piled up!