It is a valid problem but hell it is a very attacked problem. There are thousands of staff scheduling solutions. I think "does the software work for your industry" > the algorithm used. E.g. if the vendor is proven to work for fire-fighters rosters then it is low risk for another station or brigade to adopt. It is other features like HR and payroll integration, access control, working time regulations and law, attendance recording etc. that will make a big difference.