I updated my Voyage. The menu organization and tabbed pop-up windows are nice. But bottom line is this update does absolutely nothing to improve the actual experience of reading the text of a book or document. THAT is where they need improvement, and THAT is where they have always needed improvement. I still much prefer reading in the Kindle app on my iPhone and iPad. The Voyage is used only rarely or if I go outside during the daytime to read.
After downloading and installing the update on my Voyage, it got stuck on page 1 of 7 in the Getting Started guide. It took me a few minutes to make it turn pages. Touching the
> symbol at the bottom-right of the screen did nothing, nor did swiping, nor did pressing harder. What finally worked was thumping my finger down on it rather hard! I got frustrated, but that actually worked.

(BTW, I keep the page buttons on the sides turned off, so they could not be used in this instance.) After I got through the Getting Started guide I noticed that I had to thump hard on some menu icons to get them to work. Other icons and turning pages within books worked fine, that is, by gently touching the screen. After using the Voyage for a little while the need to thump hard on menu icons seems to be going away. I'm not sure what caused this interface issue nor why it seems to be getting better with use.