The Zoe, I've heard, is one of the best. It even has a speed limiter wheel, allowing you to set the maximum zoom speed even if you put maximum pressure on the rocker. You can roll the wheel as you're zooming though to vary the max speed. The one complaint I have about the Zoe is that the orientation of this wheel was not well thought out. It would have been better to turn it 90 degrees. The Zoe price is high too, around $320 + shipping.