the A6000 certainly has a very different feel in the hand (I'm comparing it to a gripped A900!), but I am slowly getting used to using it.
I have EVF set to display what I am changing when I am setting things (IE it switches to mimic the rear LCD), so I can select things off menus, etc, with the camera to my eye - which makes it much easier to use.
It did take a few tries to get a custom menu set that I was happy with, and I'm still not sure I have it right.
I suspect I will upgrade to an A6300, but probably in a years time, when the price has had a chance to 'settle'
All my current e-mount lenses have OSS, so I'm not missing IBIS currently. It's difficult to tell how much I'd miss it if I were using an A6300 + A-Mount lenses via adaptor - in part it will depend on the ISO behaviour.
I have my A6000 set to Auto 100-3200, as 3200 ISO images using it are quite acceptable - while my A900 I keep at ISO 200 unless I need to increase it (I do set higher standards for the images from my A900 though).
ISO is probably giving me a couple of stops, since the A900 is fine at 800, and acceptable up to 1600 with some PP, while IBIS gives 2-3 stops.
What I need is the A99II, to do it all in a single body