Having previously seen the anime series of Death Note, I was also curious about the manga they were based on. As it was my first experience with Manga (and I had little experience reading other types of graphic novels as well) I anticipated some problems, but this wasn't necessary. It just took a little bit of getting used, but before I knew it, it was like I never did anything else.
The main thing I noticed when reading Boredom was how closely the anime followed the manga, making that the story came to life even more. I'm already looking forward to the rest of the series!