I glanced at the players guide, but did not have time to look through it all in detail. I would like to read more about it (kinda how I read about WotBS from the various PbPs )
Seems a fair assessment, though Firefly is hardly the only/first source for space/westerns.
But I like what I've seen of it so far. Frankly I'd love to try either and/or both. I do have a particular soft spot for sci fi...but Zeitgeist seems quirky and interesting as well.