I have one and at first, it seemed really awkward. So I watched the video and did EXACTLY what the guy in the video told me to do (and what not to do). After an hour of practice or so, it finally "clicked" and now I really like it - can tell the difference in my right hand (I have carpal tunnel), especially if I have a ton of cutting to do. My hands are no longer aching after a long day of cutting, piecing, sewing, pressing, etc.
HOWEVER, for strips, I still prefer my June Tailor SHAPE CUT PLUS Ruler with a regular rotary cutter.