For fiction and other pleasure reading, I'm all-in for ebooks. I use my Kindle almost exclusively for this. However, I do have a bunch of shelves of treasured books, mostly hardcovers, that I just feel good having near me.
On the other hand, I find the ebook experience for reference material - like programming manuals - completely awful. I find that I'm always wanting to flip back-and-forth between pages, and even have multiple books open simultaneously. Paper books laid out on a desktop, with bookmarks at important spots, accomplish this very well. It seems like this is an experience that ebooks *could* emulate, but I haven't found anything that does so well.