My buddy tried the heavy duty ballcups and didn't like them. I used to use traxxas captured ends for the longest time. Now back to stock ae ballstuds and ballcups. Captured ends are nice. Some say you'll start breaking other parts with em, but I never broke anything using them all around the car. I'd still use em but they get to sloppy to fast. If you don't mind running a car that wiggles all over go with captured ends.