As a fan of the original FASA Shadowrun, published in 1989, I was really excited to see a sourcebook for Shadowrun 4e set in the original setting. While I understand the logic in updating the technology of the 2074 setting to reflect real world advancements between the 1980s and 2012, for me Cyberpunk works best like Steampunk - a retro futuristic setting. It's the dark future, as imagined in the 1980s.
As much as I like the setting of the original game, I have to admit that the 4th edition rules are an improvement and easier to learn. With an excellent (and free!) set of Quickstart rules it's also better for getting new players up to speed with the system.
The 2050 Sourcebook includes setting information for players who started with the current edition and are unfamiliar with the world of Deckers, Lonestar, Maria Mercurial and the Renraku Arcology. It also has rules for the old school Decking, Magic, Gear and starting characters. There are a few minor differences between the character selection here and in the original book - there are more Meta Humans, and an Adept instead of a Gang Member, but overall it has the same feel as the 1st edition selection.
I was planning on running a game of old school Shadowrun with the original rules, but the 2050 sourcebook has convinced me to switch to the 4th edition instead.
[5 of 5 Stars!]