Voyage has 300ppi as well, so it's readable from close distances (kinda like low-quality laser print); research articles often have two columns per A4 so I just zoom in 200% and am more-less fine. I would rather have 8"+ 4:3 of course. And sometimes PDF rendering is extremely slow as well, but...
On the other hand if I need a certain photography setup for achieving a certain look, I can use Voyage for that - imagine instead of a PDF book with lighting setups and examples of results you had a piece of paper with a drawing - seems pretty comparable quality-wise.