IMO the builds should be updating automatically to the next buld until the final version is reached and beta builds should update to next beta builds until...final. (this is how firefox works - at least for betas)
After this point the updater should fall back into the "update to next final release" mode.
Why:
- people using builds are most likely devs or very technology interested users which want to be up to date
- people using betas are a little bit less interested in the bleeding edge but still want the update to the next beta since it is more stable
- the average user should be clear ;-) ... |