I just picked up a 6 and threw on the 8.1.2 and I'm quite impressed. So impressed I loaded it onto my wife and I's iPads (we were both still running ios6). I notice the speed on the 6 man it's quick, mind you I have been on a 4 since it came out. Our iPads not so much cuz they're old. I was a little pissed with the width of it in regards to left-handed texting (I'm serious lol), but I loaded up a one handed keyboard app called Blink, that makes the keyboard the same size as on a 5/5s, supports English/Spanish/German, the autocorrect works and it has emoji built in. There are some very good features, I've always wanted to jailbreak, maybe I'll try that with my 4, which has now become an iPod touch. Great OS so far, they really worked out the bugs, which luckily I missed.