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Well they also work going backwards depending on if you gear the thing properly. The trouble really occurs when you are turning. We find that if we turn too quickly the ball slips out.
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One thing we do to help this is to adjust the speeds of the Mecanum wheels so the center of turn of the robot is near the center of the ball.
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We use a FP on our ball magnet and we have no problems with it works great! I'm not sure what the ratio to the roller is but i know we use a FP motor on the roller
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We also use and FP and I believe we use about a 4:1 speed increase to a 1" diameter roller.
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When doing this you want to make sure that you use small diameter rollers and cover it with somthing that doesn't slid on the ball (your choice)
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We covered our roller with a small diameter bicycle inner tube. To get the inner tube stretched over the roller, we put the aluminum roller inside a steel pipe and stretched just a bit of the inner tube over the pipe. Pressurizing the pipe inflates the tube and the roller drops right in - then trim the inner tube to length.
A couple of other notes. To get variable shot selection we reverse the direction of the roller just before the kick to push the ball out in front a bit. By varying the lead time, we can get a good shot from all three zones even though the kicking force is the same all the time.
Also, when driving forward with the ball magnet pulling the ball into the robot, our robot would start to "power hop". We reverse the roller with speed propotionate the forward speed to avoid this.