Nextiva vFax Review Summary: Nextiva’s “Single User” plan is unfathomably cheap, in case you’re willing to pay every year as opposed to month to month. Also, the organization gives great, U.S.- based backing and is keeping on enhancing their item. Unless you require highlights like e-marking or cell phone applications, Nextiva’s offer is a hard one to stand up to.nnually rather than monthly. Additionally, the company provides high quality, U.S.-based support and is continuing to improve their product. Unless you need features like e-signing or smartphone apps, Nextiva’s offer is a hard one to resist.