Square Beta Feature: Comp & Void

[VCB]

Anyone using the "Comp & Void" feature in the Square Register Beta?  I see little to no need for these feature....maybe some use for the Comp.  Most of us have already set up a discount to handle the issues this feature is trying to address.  I really don't understand the item "void" purpose, since most of us probably just delete/remove and item if a customer changes their mind. Its not a feature you can access post-sale, so why would you ever use void?