The MSAProfessional (only if configured to use the Epic), the Vantage and the VantagePro Systems. Only the VantagePro is currently supported by IHT.
The Epic Stylus was first released in 2006 as an upgrade to the MSAS Professional. Any system built before 2006 does not have the ports needed or the hardware configuration to be able to handle an epic. Therefore, the MSA BEST, MSA 21 and a certain number of MSAS Professionals are unable to use the Epic Stylus.