The old comics with predictable frame sequences can be read easily in electronic format, but anything from the late 80's onward requires the ability to see the entire two-page splash to know which direction you're supposed to scroll on your not-adequately-sized-for-comics-pages digital device. Even reading them in trade format can be hard since sometimes comics artists forget that trades can't bend their spines 180 degrees open, and they draw solely for the periodicals.