I download and installed IOS 8 on Lilliam’s iPhone and it worked fine. I saw no dramatic performance reduction. After playing with it for about an hour, I downloaded it and installed it on my iPhone as well.
If you have any eligible iPhone, it think you will like the new system. There are a lot of new goodies that make the install worthwhile.
My hunch is that it will be fine on iPad 2 if your main use is surfing the web, reading books and responding to emails. I want to get a newer iPad when I go to the U.S.
They are scheduled to release a larger sized iPad in October. If it is on the shelves, I will check it out and make my decision which to buy.
I also upgraded my Apple TV’s OS. Its new look is more compatible with IOS 8. They also added Beats Music, but I am happy with Apple Radio. Yesterday was a good technology day.
UPDATE: I was using my MacBook Air, which is running the beta Yosemite OS. A call came into my iPhone, running IOS 8, and the call showed up on my MacBook Air. I could have answered it on my laptop. This is one of the new features which is available if you are running IOS 8 and Yosemite, That is going to be a great feature!