I'm jailbroken on iOS 7 and I did it right when it came out, and it is terrible, the software is old so that I can't even take picture anymore cause my camera button don't work. If you're gonna jailbreak on iOS 8 just wait till about July when all the good software updates are out, or do the iOS 7 jailbreak... I love the iOS 7 one other than it being so outdated
iOS 8 is apparently having issues right now such as apps crashing and not working properly. I have a jailbroken iPad on iOS 7 and I am going to stay like that for at least another month or longer.