[dzhiurgis]

That's what I did.

Also updated it to iOS 8 GM and boy was that a mistake. Everything is slow, lot's of bugs.

[randomdata]

I upgraded to iOS 8 on my 4S and found it to be a nice improvement. I'm not sure if I'll even upgrade my device during this cycle. It feels like it has plenty of life left to me.

[Adirael]

Same. The betas where buggy and crashy but the GM works OK. I don't notice it being slower than iOS 7.