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My experience with PDF is as follows:
A5 PDFs are no problem (unless the font size is very, very small) at all, for A4 it is possible to change to landscape and it splits the page into three parts. I think it's not really great if the majority of your books is A4 PDFs but for the occasional PDF it is perfectly acceptable and I had no trouble with it.
Another thing you should keep in mind is that - at least in my case - it never remembers the last position in the PDF. Whenever I had to stop reading suddenly and didnt take note of the page I was on, an orgy of jumps and page forwards ensued to find back to the page I had left off.
I have no idea how the Cybook reacts to large images and tables, though. I had very few and rather small illustrations in my PDFs, they were fine but fit fully onto the one-third split page. I have no idea what the Cybook would do with images larger than the split-page size.
If you have too many PDFs to convert manually (which is the case, you say) you could give "calibre" a try. What is especially handy for your necessities is that it doesn't just convert all your PDFs. It leaves them in place and only converts those documents you send to the Cybook on the fly without changing your library. So you wouldn't have to spend hours converting, wouldn't lose files due to a bad conversion and have always the option to change to something else with your original PDFs if the opportunity arises.
I have tried to convert a PDF via calibre and it seemed to work fine (haven't read the entire thing on the Cybook as it was only a test but I checked various pages throughout the document on the device). That, however, was a text-PDF (not scanned pages). I have no idea what the result would look like if it's all just graphics but I assume that it would reduce the images in size so they fit onto the screen in portrait orientation and that they would probably end up unreadly due to size. I would give it a try, however, the program is impressive considering that it's just a few people spending some of their spare time on it. There are more features than in any commercially available software solution I am aware of and especially the conversion works very well (not perfect, mind you, but neither do the other converters and most of them are specialized to handle only a very limited number of formats).
Other than that I doubt that there is much you can do short of a screen the size of the A4 images in your PDFs...
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