My experience with Nook
If you want to read pdf files only, think twice before buying Nook. The first pdf was OK, but when I transfer around 40 documents in pdf the ebook reader went crazy connecting to the online page and deleting my files or giving me errors. A total nightmare. I went back to the store the same night and returned Nook. I guess the best bet is a laptop or maybe a tablet, but the screen may no be good to read for a long time.