Read this authenticated review
Yes - We recently added some new modules to UltiPro - Employee File Management and Employee Case Management. These new modules did not impact UltiPro Core, so there was no downtime of the system. The new modules work fine and we are setting up to speed on them. The UltiPro system is automatically upgraded twice a year and there is rarely any negative impact from these upgrades. They are usually invisible except for the new features available.