I love the G4. Great battery life, great camera. SD card expansion, so you're never 100% tied to your storage option albeit 16/32/64. The removable battery is a great option, even though I don't use it. I prefer to carry around those battery packs, because I can not only charge my phone, but my tablet, my friend's phones, playstation vita, etc. But I do appreciate the removable battery because that means I can get rid of it and throw in a new one in 6-9 months from now.
The screen is gorgeous. It's a little dim with auto-brightness, but I hope they'll fix it. But that doesn't mean the screen is dim. The screen is REALLY bright and very well suited for outdoor visibility.
Camera? Awesome. Awesome camera.
Just check these pictures I took yesterday.
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I think overall, this phone is a winner. Sure, battery COULD be larger. Front facing speakers COULD have been implemented. A larger camera sensor MIGHT have been able to be fit inside... Sure, if we're going to make a Franken-phone, of course we could always find ways to better the devices. I've played around with a lot of devices, and I must say, I'm very happy with my G4.

No lag no miss-tap (I have the European model), no issues. The device also runs cool! My favorite feature

haha.