A: Other Coravin systems use needles that gets inserted through the cork which allows you to pour your chosen amount of wine without taking out the cork... and therefore never exposing any of the wine to air.
The Pivot system requires that you uncork/open the bottle of wine, and then replace the cork with a specially designed Pivot stopper. The Pivot then gets inserted through this stopper to pour your desired amount of wine. Because you need to open the bottle first to use the Coravin Pivot system, wine is preserved for a max of 4 weeks. As a comparison, the other systems can preserve wine indefinitely.