I have one and like it. It's NOT a Turbo Dyno, and is best used to compair motors (since it is a no load dyno). I always use 5vdc for the set voltage. After that, it gives RPMs, some unknown torque rating and a comm number (which I haven't figured out since I really don't see a use for this number other than seeing if the cut was good...lower number, better comm condition). The more you use it, the more you will get used to what numbers to expect.
Speed Passion Motors and ESCs