I'm using 2.1.4, and i have a major complaint about it.
It's too damn fast.
It used to be that I could touch the screen for the next page when I got to the bottom line of text, and the screen would update just as I finished the line.
Now, I have to finish the line before touching the screen!
Also, and I'm not sure its not just my imagination, but I think that page turning is leaving less static on the page, so you don't have to do the 'redraw' of the screen as often.