I received and applied the long-awaited official Android 4.1 (Jelly Bean) update to my standard, not rooted Asus Transformer Prime TF201 tablet but in my case the results were not as expected; I didn't feel any of the smoothness and fluidity that I'm used to feel for example on my Galaxy Nexus. Fortunately,
everything changed after doing a "Factory data reset" (in Backup &
Reset settings); I had to reinstall my apps, but now the tablet runs super fast
and super smooth.
:-D