Spinning bar-type bots have definitely proven to be effective thus far in the series.
You might want to take note that the bars are susceptible to snapping due to the impacts, and your bot will also go out of control due to the recoil of the blow.
From the above points, I would suggest you:
1) Prepare spare bars
2) Have a backup weapon in case it snaps during battle
3) Make sure your chassis can withstand the shock of the recoil
4) Try to have a low CG to avoid flipping yourself from the impact.
5) Put LEDs on your bar so that it will shows a dickbutt when it spins