Talon 540, in a workshop, shot a short video of our robot running with SD540's. We will vouch for the quality of them given the performance in the video!
We used six: four for the mecanum wheels, one for the lift, and one for the pneumatic system.
The video is linked below:
http://youtu.be/9lq6U3EpTg
mindsensors, the manufacturer, is linked below:
http://www.mindsensors.com/