ViaSat has recently started offering the Liberty Plans to more areas and replacing the older/classic plans having a Late Night Free Zone.
The Liberty Plan model gives you a fixed amount of priority data at normal/higher speeds up to 12 Mbps (with a newly introduced modem offered in certain areas those speeds can be increased to 25 Mbps).
Once you use up your priority data for a month, you're speed will drop to 1 - 5 Mbps depending on then current network conditions.
The Liberty Plans do not offer a free zone - however, most are finding that those lower speeds to be acceptable for the majority of their Internet needs effectively giving them virtually unlimited data.
There are some exceptions as to whether a Liberty Plan is the right personal choice, but largely it depends on the need for extremely large downloads like games.