I downloaded the free preview, and liked it enough to grab the full game. I wanted to jot a quick review while the sale was still going on.
I'd say if you're on the fence about this game, GET IT. I haven't read it cover to cover and haven't had a chance to play it yet, but it is really cool. The setting is great; it does what it sets out to do. They capture the flavor of Barsoom, add a side order of HG wells and a generous dash of HP Lovecraft. The PC white apes are a little more Planet of the Apes than Barsoom (I think, having only read A Princess of Mars) but that makes them more playable as a PC race. THe rules for the Earthman race are cool, and the classes are neat.
A very strong addition to the d20 rule-set is the Stunts rules (Making combat more interesting and swashbuckling), and I like the Device Points mechanic for the Mad Scientist advanced class.
One gripe, and this might just be my ignorance of Savage Worlds in general, is I didn't find it clear if you need the SW core book to play the SW version of Mars. This would be a fun setting in which to explore SW, and I might have tried the SW version if I knew I didn't need the core book. That said, they're both half off right now....
Summary: this seems Awesome! If you like low/non magic swashbuckling pulp entertainment, you'll dig it. Of you're not sure, try it out anyway, it might change your mind.
[5 of 5 Stars!]