I read Hardcore Zen by Brad Warner at a fairly young age and liked his characterization of it. Like I said, it has a straightforward, practical quality to it that I appreciate. Most of what ive read on it since (im currently reading The Three Pillars of Zen, which is also from a Soto perspective) emphasizes discipline more than "religious" practices, which appeals to me. Im not much for religious ceremony or ritual, but i can understand discipline and practice. Even if I often fall short.