You shouldn't update until they release it to the general public and there is also a jailbreak for it. If you are real eager to try it out, just use another device you don't really care about. Just my 2 cents. :D
iOS 8 beta 1 is running pretty good on my iPhone 5s. I like all those new security features that Apple has added. Apple didn't fall to Heartbleed while Android took it headon. Android should be the one copying Apple. :thumbsup: