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These little motors bridge the power gap between the AX-12 and MX series with a medium priced package that still fits the AX form factor. Like all dynamixel servos, they are wonderful alternatives to standard RC servos for anyone looking to create robots on a hobbyist budget. They come pre-calibrated with great ROS support and wonderful features for torque, wheel, and position control. All of that makes them highly useful and essential to many of my projects. They are really no strong alternatives for mot of my robots.
Unfortunately, they have some distinct downsides compared to the rest of Robotis's servo line up. They are prone to over heat and break more often than the Ax-12 or MX series. Their motion response time is slower to respond than the AX-12 and they are more prone to noisy jitter in application.
Make no mistake, for their price point and torque output, there are no better servos on the market. I only wish they lived up to the quality level of the other excellent servos that Robotis makes.