FONGD Sure, you can trial Billings 3 before committing to it, but suggesting that you can "easily" revert back to Billings 2 if you don't like 3 is somewhat disingenuous because there is no "downgrade wizard" (AFAIK) which means there is no way to keep data that you may have created using the Billings 3 trial (and running both 2 and 3 at the same time is not possible). The only way to "revert" back to 2 after using 3 is to constantly rename the Billings data folder when switching between versions 2 and 3, and (manually) make sure that your entries are in sync between the two versions. I'm not suggesting that the trial is useless, but suggesting that it's an easy process to revert back is a little misleading, IMHO.
(Version 3.0.1)