Hands on with Apple's Mac App Store | Software | MacUser | Macworld: The Mac App Store feels very much like a version 1.0 product—some might even say it feels like a beta. There are interface issues and some mixed results with the Store’s ability to recognize the version of software you currently have installed, so you need to proceed with a careful eye to avoid purchasing an app you already have.
Overall, the Mac App Store experience is much like the iTunes Store; it’s easy to navigate, find software, buy and install new apps—and that’s a good thing. Hopefully, the issues I encountered will be ironed out sooner rather than later.