The App Screens
Your apps are listed pretty much like they were before, on screens that you Swype left and right. Swype all the way left and you get one screen full of all apps installed. The tiled screens do not list all apps so this is a handy feature.
Overall, with a few tweaks the interface would not be bad. However, if you already loved the Samsung TouchWiz screen and had customized it to your liking with widgets as I did, you will not appreciate that all of that is gone and dumbed down.
And yes, you can turn it off. It does not actually “take over” your phone interace as some of the rumors would suggest. Facebook home is just an app. It includes an easy on/off switch. If you want to just try it out, there is no fear that it will take over or mess up your phone. Simply access the settings for the app, and turn it off. You can decide to turn it back on again at any time by just opening the App.
I did not experience any problems or crashing when using it.