I'm happy with every Apple device I own:
iPhone 6 Slate 16GB with T-Mobile - Unlimited LTE on iOS 8
iPad Mini Retina 64GB Silver WiFi jailbroken on iOS 7.1.x
15" MacBook Retina Late 2013 Base (16GB, Iris Pro) on 10.10
I love each one. I don't notice a hiccup from lack of memory even though I'm a huge advocate for 2GB ram on iOS devices. My Mac plays all the games I want to play (FF14, LoL, BL2, BL Pre-Sequel, DOTA2), my iPhone does everything I need it to.
Continuity and handoff is amazing and I can't wait for full SMS integration. It's very seamless.
I'm glad I have one device that's JB. I have all my bases covered. At my friend's house, he has an Apple TV and he authorized my devices for it so I can be on my iPad and if I see a funny video, I just send it to the Apple TV and we can all watch it. It's very "this is how Tony Stark would use these things" like.
I like that I can one hand my phone but still have a big enough screen for Netflix, pictures, games, things like that.