I was on the fence about this but the clunky zooming when reading PDFs made me decide not to get it. I think a tablet is better for browsing PDFs.
I've tried reading PDF's on my Kindle, but it's just so frustrating to navigate around the page. But the iPad is perfect.
Most documents have more than enough margin that the final cropped document is then readable on the RM1. (Eventhough I wear readers I don't like to see microtype). Those same programs can also be used to split two column papers.
RM1 has a built in crop tool but I find it slows things down a bit and it won't work to split a two column layout.
Plus, I can draw, animate, and watch youtube on the same device. It's been quite nice.
I was going to get the ReMarkable, but am very happy with my Ipad