Sardo racks were the worst invention for pool. Basically you put all the balls in a regular rack and beat them until there are divots in the table. After that, you could use the Sardo rack. If you looked at the Sardo as you were racking, it actually didnt touch half the balls. It was a huge gimmick.
We used it in the IPT and I cant tell you how many times balls either rolled funny across all the divots, it came to rest in a divot. Try shooting a ball out of a divot and having it hop. it was a nightmare!