It's recommended to do an SD partitioning to dedicate more space for the much larger size of Sense 3.0, however several folks including myself successfully installed w/o partitioning. There's some tweaking needed to fit apps on, but there's actually a 'low memory wizard' to help move apps 2sd or uninstall. Every now and then I can tell I'm pushin it, but 90% of the time it runs smooth as butter. The customization is out of this world!