There is not a significant difference between these units. While both utilize the same technology and provide many of the same capabilities, the EYE XO is $3,000 more expensive. The major difference is the ease of not requiring marked golf balls and the additional club data. With the EYE XO, you can view your impact position in great detail, which is a pretty unique feature. Both systems offer everything you might want in a launch monitor, including speed, accuracy, in-depth golf swing analysis, and golf simulation.