I know that the latest version is called “Alpha”. But actually there was only one major change between 2.0.x and 3.0.0 which is that outbound rules are now evaluated in reverse order, which is much more consistent. However, as we thought that people _may_ run into issues because of that, we started to call the latest releases 3.0.0.Alpha.
So IMO 3.0.0.Alpha10 is actually more stable than 2.0.12.Final, because it contains more bug fixes.
But I really thin that we should release Rewrite 3.0.0.Final soon.