Harvest does time and expense tracking, project management, budget tracking, invoicing and scheduling all in one place. While the MYOB Team App, combined with some ARL/Essentials features does some of these tasks, Harvest centralises that and integrates it with easy business management for projects and scheduling of resources.
This would be a great integration for SMEs, especially those who are more service-based professionals, working to engagement scopes and projects. Eg. Designers, marketers, builders, etc - could also be used by small accountants/book-keepers also who don't need to run a dedicated practice solution.