My goodness this thing is fast. I didn't think Samsung was capable of making a phone that didn't lag but boy was I wrong. The animations are shooter smooth and more importantly fast, no more touching the screen and waiting for something to happen. The camera takes great detailed pictures and I'm loving the new toolbox feature. On the S3 and S4 I rooted, installed a custom recovery, and immediately installed an aosp based rom. However on the S5 I see absolutely no need to do so and while I did root and use TB to freeze a few apps, i will probably wait for some good TouchWiz roms before installing a recovery.