I can sum it up in one word.
Or lack of. Network and wifi reception on the SIII was nowhere near as good as the Maxx or any of my other previous Moto devices. Same situation I had with the G'Nex. One other thing I did not like is that it was very uncomfortable to hold and use one handed. Even with a case. The buttons were down so low that they were really hard to thumb reach and the curved bottom made it really hard to keep a good hold on it. Battery life??? Well that goes without saying. Just nothing about it made me want to keep it and ditch the Maxx.
Played with a Sprint S3. Picking up my daughter's Verizon S3 tomorrow.
I'll keep my Maxx.
I have forgotten more about technology, than most people will ever know in their lifetime.
The MAXX is perfect for me. The only reason I will upgrade now is if it is no longer supported, and the battery life of the replacement is as good or better than the MAXX.
That said, I don't care what tiny features might be better than what the MAXX has to offer. If it doesn't have equal or greater battery life, forget it.
The Galaxy S3 reminds me of a great phone to give my wife once she gets bored of her white iPhone.
I'll stick with the Maxx.
Does the S3 have Siri?