I'm working on a book-length project—I've chosen Garamond for a font and the printer has offered me two choices: Adobe Garamond Premier Pro as well as Adobe Garamond Pro.

Looking at the Adobe website, its stated that Premier Pro is an 'improvement' of the latter, but can anyone tell me whether the difference can be appreciated?

:?:

I have been investigated this a bit. If you look compare the fonts, there are a number of small differences: stem widths, cap height, ascenders, most obviously. The older Garamond Pro is taller, skinnier, and simpler (nearly rectangular stems irather than tapered). And many of the characters are a little bit wider.

If you blow them up (I found this on the net below and uploaded it to my profile), Garamond Premiere looks almost crude in comparison (These are at 300 DPI). But of course these are text fonts, not intended to be used at huge sizes.