i have been reading Raygun Revival
on various ereaders. It has been formatted as a two column and 3 column pdf.
All of the various readers do something different from each other when using reflow. Dropping letters, bits of dialogue mixed with the next column. Plus of course they all loose the justification to varying degrees.
Thats why its important to have very good zoom options. That is what you need for PDFs. That is what the Boox does well.
I find the landscape fit to width zoom of the DR800SG to be just zoomed enough to read comfortably. I can even remove my glasses and read comfortably. But if you want to read in portrait the zoom and pan is cumbersome. Its important to me as I really don't like having multiple columns on a page. I find it kind of distracting, i keeping looking ahead!
PocketBooks column zoom is fantastic. You select how many columns the pdf has and it zooms the column to fit the screen and cuts the page into segements. Then you page through the segments. Its very effective and makes for a good reading experience. on the progress bar is a little animated icon to show you which segment of the page you are reading.
Plus when it turns the full page it starts properly at the top of the next correct column!
Boox 60s zoom options are somewhat the same as the DR800 but much easier to tune and use. I have been choosing to zoom the pdf 200% then using the stylus to go through it in segments ala the PocketBook. Its quite a bit easier to do than on the Irex. I just grab the bottom of the line and drag it up. Then when i want to move to the next column i grab the upper right corner and drag it down to the left bottom. Its smooth and accurate.
But when you go to the next page you have to drag to the beginning yourself.
I have just recently purchased a new video camera and will be showing this in a comparison video very soon.