_I have an Asus transformer TF101 android tablet, running Android 3.2 (Honeycomb), the Android OS made for tablets. Its smooth, responsive and clear. Asus announced, when they released their new Transformer model, the Asus Transformer Prime (they are in legal dispute with Hasbro, the creators of the toyline Transformers, over the use of the name), which is an Android 4 tablet, that an update to Ice Cream Sandwhich (the codename for Android 4) would become available for TF101 users.
_It has, what I assume is the download itself, and then it installs the components for the upgrade. The whole process takes 5-10 minutes. Relatively quick.
_Ice Cream Sandwich was developed with the view that it can work on both phones and tablets.
_The touch screen feels more responsive as does typing, but not a huge improvement on Android 3 as Honeycomb was pretty good on this aspect.
The screen looks crisper and the new font for the UI looks made for higher definition screen and looks far better than Android 3.
As Android 3 was never for phones, this update is more geared to that market. Moving from Android 2.3 (Gingerbread) to 4 would seem like a massive jump in functionality, resolutions and speed, but moving from Android 3 to 4 isn’t.
Overall, its nice to have the latest OS, but it doesn't make that much of a difference to the TF101 out the box.