I got a chance to play with an iPad 2 yesterday running iOS 4. I will say it ran the OS fairly snappy but today's websites really slow it down . I didn't think the Internet would have that much of an impact but it did. Not every website slowed it down but Engadget, CNET and few others did. It was my sister's iPad who refuses to update the Apps and or iOS . It does everything she needs it to so why update . You could argue for security reasons for sure but she does not do anything that is information sensitive on it . Just interesting to see how the iPad 2 would hold up running iOS 4 today.