Had a good play with several PDFs now and it's definitely down to the PDF reader.

Basically you can zoom in and rotate PDFs and the responsive touch screen makes it really easy to move around the document. The problem is when you come to turn the page. If you're zoomed in (as you're likely to be on 99% of PDFs) you can't. You have to zoom out again before the next page then zoom in again to start reading. This is really painful, especially when compared to page turning on epubs which is easy, fast and a real joy.

It's a shame as it's seems like it's almost there for PDFs. If you could just just continue onto the next page by either continuing to drag or the normal page turns it would be fine.

Perhaps there are other PDF readers you can install? Though I've no idea where or how to do that.