Moved over from the Iphone 3Gs and have been very happy that I did. The only draw back is that I am still learning the new operating system. Got the phone the day after the release of the 4s. Camera and video are excellent. Options and widgets (apps) are same as Iphone.
If you are a business person, I highly recommend the car adapter (great) and the extra battery with charger. You will be set!!!
I have had several different smart phones, and I have to say this one beats them all hands down! What a great phone! Wait, it's more like a great computer you hold in your hand. It's quick, precise, and with the functionality you would expect from a company like Samsung! You can't go wrong with this one!
As with most new tool, there is a love-hate relationship at first. I love the features and capability of the phone. I don't love the execution. The touch screen requires "swiping" to perform some simple tasks - like answering a call - which can make one-handed operation difficult. The voice command really needs some help. I speak clearly and without accent, but the system can not detect the difference between Deven and Thelma when voice dialing.
Overall it is a terrific appliance and I love the display, adaptability, etc. I just wish it were easier to use ;-(