First of all, we love using TWS. As a .NET shop, we really appreciate having a familiar IDE to work in. That being said, Salesforce has announced an update to their VS Code extension (Available Oct. 13th, 2018) that will support Sandboxes. Because VS Code has TFS support, we are seriously looking at this as a replacement IDE.
As early adopters and fans of TWS, we're happy to wait, but we would like some sort of assurance from the product development team that the feature is on the roadmap.