IE9 (Beta) was very much appealing to me, optimized sites like Facebook, CNN & Linkedln worked beyond expectations with very smooth scrolling and far less CPU utilization especially for flash based content. I tested this out with the famous farmville game on facebook and to my amazement the CPU utilization was much lower than with IE8 or Chrome. Even non-optimized sites such as my company website and many other sites were much smoother and faster with maybe just a few minor rendering flaws, well this is a beta afterall. The tabs seem to respond way faster and they seem to be more isolated from the other tabs meaning that a bad screw-up on one website will be less likely to jam the entire browser. Starting IE and Quitting has improved alot too. I have also noticed that the CPU idle speed after opening many tabbed sites was very much similar to the idle speed of the computer itself after startup. Typing is smoother as well. The only concern is the battery life, I have not been able to test this but I do realize that the excess use of the GPU will cause a higher power usage than that of the CPU at Moderate levels, then again the low idle CPU usage may favor those who have many tabs opened at once which might just compensate for the excess GPU usage under certain circumstances.
So far the only problematic site I came across was IE9 rendering of youtube seems to be very distructive, the entire page is made to look like a personal 90's website.
