author=bill t. All the advantages of a tripod, except for relief from the weight. The demo system was suspended by bungees, which was definitely a lifesaver.
They work very well, with some caveats. Any time I've used them has been for aerials and I didn't have to worry much about how much they weigh since they were attached to the Tyler mount.. For full stabilization, you need three - one for each axis of roll, pitch and yaw. I've heard of people using them in pairs or even singly, but you'd get one-axis stabilization only. They need to be firmly attached to the camera or its support system. Once I'd used them, I specified them for all future shoots. Film camera lenses had no stabilization in those days and the gyros really do work, in spite of their complexity, weight, install time and rental cost.
I notice the one in your URL mentions 115V 400Hz for runup. I wonder if you can run it up on the battery as well.
Aircraft electrical systems are usually 400 Hz. Since they were primarily designed for aerial shooting the Ken-Lab gyros conform to this spec. The power supply may be smaller now, but when I was using them a few years ago, the power supply was substantial. It was a 10" cube and weighed probably 10 lbs. I imagine that the power supply for land use would conform to normal battery voltages like 12VDC. Contact Ken-Lab for more info on this.
They do take a while to get up to speed. A few minutes.