Interface Zero is a great setting and a fine addition to Savage Worlds, but Boston: Broken Cradle of Liberty is one of the best Savage products I've seen in a long time. The setting is evocotive and B: BCL adds a few handy optional rules to the Fast! Furious! Fun! system of play that makes Savage Worlds such a joy to play and run. In particular, the City Trappings are a brilliant idea and are a great example of an optional rule that adds to the flavor without slowing the game down at all - it should be (and probably will be) copied for other SW settings.
The PDF is an excellent production and better than many e-books put out by major publishing houses. The layering allows you to have a full-color electronic version while also being able to select options for a stripped down printer-friendly version, with everything in between. If you like cyberpunk, post-cyberpunk, or even just appreciate fine game writing, this is an excellent value.