Yes. Nice. Alright. Let's go.
Old Man's War is the first book I've read in one day since the summer I was a ten year-old dweeb. Scalzi's prose is so effortless and masterful that the tale ran through my brain as though it were transferred by BrainPal rather than the printed word.
I haven't read Starship Troopers, though there is a sense--hinted at in the afterword, and hinted at by the very nature of the story--that this is some sort of tribute, or at least, a riffing. I can't say whether that's exactly the case, but I know a few things: Old Man's War is loaded with sweet technology, awesome aliens, and some wicked battle scenes. It's also a nice, round three-hundred pages, which I appreciate--I'm not one for epics.
This was my first taste of John Scalzi's fiction writing (I've visited Whatever a few times, of course). Without a doubt, it won't be my last.
Now, to go read Starship Troopers...