I use ezPDF to view magazines on my vega. It does a good job, there are black bars top and bottom, viewing A4 docs in portrait due to the 16:9 screen. But the text is perfectly viewable without zooming in. If the PDF is large in size and contains a lot of images, it does take the vega a second to switch pages. I can only put this down to the amount of ram in the vega, or a problem with ezPDF.
On a different note comic reader mobi works great on the vega. If you like that sort of thing...
Hope it helps