I just did a random reading speed test and got 1640wpm with 90% comprehension, and I definitely do not read linearly -- it's hard to explain, but I often find that I scan far ahead and see the ends of sentences before their starting words, then wander around somewhat randomly in the middle of them. I'll notice typos and grammar errors several sentences or even a paragraph after where it occurs, probably meaning that I'm taking huge "gulps" of words and internally buffering it, then processing it very nonlinearly. I've never taken any courses on speed reading, but I guess I developed this habit from reading code (where a lot of the time is spent seeking). The Spritz experience was a little disorienting since I kept wanting to seek around in the text, and being linearly spoonfed it gave me the feeling of losing track of what I'd just "read".