Matt,
Team 1403 used plastic sliders in 2004, and I don't recall having any issues with them. You are considerably more maneuverable, but do realize that you will be very easy to push when on the field. You will have slightly less control over the robot, and the driver will have to become used to the changes.
Make sure you have some extra sliders when at the competition because make no mistake, they will wear down. It's always good to have spares.
