iPad Mini first gen iOS 8
I currently have iOS 8.1 jailbroken on my iPad mini. I updated for the continuity features which I enjoy and use all the time, especially sms relay and calling through the iPad. I figured it would most likely take a performance hit, but not as much as you'd think. I did start over from a new device, so that was an initial pain, but it's absolutely ok now. Battery life did take a hit, as I was getting 2 days of use out of it on iOS 7.1.2 and now only getting a day. I don't like that at all, but I'm dealing. I'm very happy to have my jailbreak back for the Untrusted Hosts Blocker which I can't live without anymore for web surfing, as well as SwipeSelection for the keyboard. I also have my 4S jailbroken for tethering on my unlimited plan. So basically, if you really want those iOS 8 features and now with the jailbreak, it's ok. I hear 8.1.1 is supposed to bring iPad 2 fixes which could basically mean A5 device fixes, but it also patches the jailbreak, so that's something else to consider. The choice is yours!