So, the "union" in this case is literally just your store. Sure, there will be a rep who will train you all in negotiating, and resources, and networking with other union stores, but this is partner-led, notably in the following ways.
1. Your store would elect people to be on the negotiations committee to get a contract
2. Your store would have to vote to ratify the contract in another democratic vote
For example: Elmwood and Genesee in Buffalo each have negotiations committees of about 4-5 partners who were elected by their stores.
So, while it is true that "you may gain, you may lose, or you could stay the same", its the partners writing the contract and the partners approving the contract. If you negotiated less than what you have, I don't see why you should vote yes for that contract.
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$1 if you ever wanted to discuss in more detail what the process looks like from a partner going through it.