The small states like the plan because in this plan, it was suggested that every state will have the right to vote in the congress without any boundary of being a small state or having lesser number of population.
According to this Plan, every state in the United States will have a right to Vote. This plan was meant to protect the rights and interests of the small states from being manipulated by the larger states.
With this plan in action, every state would have a representative in the Govt. representing the issue of small states and getting rights for them equally.