[ProDigit]

I find the refresh rates of most e-ink devices are quite sufficient!
Before you read the last word on the page, and can skip to the first word on the next page, the page has already refreshed. The Jetbook is somewhat on the slower side (about 2 seconds max for a refresh, which is a far cry from '60 seconds'),because of it's 4times the resolution of most 5 and 6" ebook readers, but you can easily adopt to it.
In fact, turning a page on a real physical book takes about just as much time (if not more,especially when pages are sticking together).

You can always press the button when you're reading the last couple of words, or the last row of text on a page, saving some of the time in the refresh procedure.

A fast refresh is less important to me than long battery life.
It is possible to have LCD speed refresh rates on E-ink, but that requires enormous power (more than an LCD would need). The lower the (electrical) power they use, the slower the refresh goes, but the longer the battery lasts.
For most people it would hardly make a difference if a book's page refreshed in .75 seconds instead of 1, but it would if their battery life decreased by 25%!