I constructed a 12'x12' deck using Dek Blocks. Very simple to use with references from the web site. Had a lot of fun and saved a lot of time and money by not using footings. I attached a link to show the work astrotoolco.com/dekblocks.html
Also it looks phase 2 is going to be in the works--The family just informed me that a hot tub is in the very near future.