The GregMat+ slot plan gives you login access to a shared account for the monthly period. One account is used by up to 3 people per group, with schedules coordinated by admin once the group fills up, so the per-slot cost is much lower than retail.
Shared account rules: do not change the password or email, do not log out other active devices, do not edit profile information. This is to keep every slot in the group learning without disruption. Violations may suspend your access.
Currently, only the 1-user (private) plan is open. Group plans will follow and will be announced once available. Until then, you can still order the 1-user plan for full private access.