I upgraded from a Kindle 4 (non-touch) to a Paperwhite 2 (touch).
At first, I was mildly disappointed with the Paperwhite.
It is noticeably thicker and heavier, and a tiny bit larger in frontal area.
If I
really tried, I could tell the text on the Paperwhite is a bit sharper; however, overall I preferred the color tone of the Kindle 4.
Something I did not realize is that you cannot turn off the light on the Paperwhite.
You can set it to be very low, but never completely off.
For page turning, I missed the physical buttons.
Now, several months later, I can say I definitely prefer the Paperwhite.
It didn't take very long to get used to the touchscreen.
The light is SO useful, and I don't mind it being on all the time.
I only read books and never have the WiFi on, the battery life is still wonderful (I have no idea how long it lasts. At least one book's worth, and I've never been inconvenienced by having to charge it.)
Here are some comparison pictures:
Side-by-side:
Kindle 4:
Paperwhite 2: