I've used the G3s for the past few years and was gonna get the G4s but decided to wait it out.
Firstly, the digital interface and display at the back is amazing. The preset mixes are (almost) perfect for a seamless workflow. The 'Mix Mode' delivers great flat frequency response. The 'Create Mode' works best for general music consumption. With the room I have, i just need to make some minor adjustments to the low ends. However, I feel like the preset mix (with minor fine tuning) is perfect for any situation.
Foam Pads provided might not be the best solution for dampening/elevating but it's a great add on by KRK in the package in my opinion.
The changeable Faceplates are a nice touch too!
In all, a pretty solid purchase. KRK really delivered with these ones. I can see myself using these for the foreseeable future.