iTunesConnect gives crash reports but only after you reach a certain threshold, and that threshold seems to be quite high, because no one I know has ever received one. FeedBackReporter is an option but it too has not been updated in a while. Last time I checked, though, it worked on 10.8.
The best option I've found is HockeyApp. Pricing starts at 10 USD / month but it does crash report symbolication on the server and its compatible with the MAS as long as you sign the executables and have the entitlements configured correctly. For me its worth the money.