Participation and Support
Get access to experiments with some delay.
Experiments and Released Builds
Get first access to the experiments.
Experiments are branches to the code that may require additional hardware or otherwise features that is not yet ready for the general consumption.
Continuous Integration Builds
This tier will give you access to the developer builds which is as often as several times a day.
Note: The released builds will be more tested. I just wanted to give something extra to those who are above and beyond.