latest mon source ?

I am using mon-1.1.0pre1 ($Id: mon,v 1.10 2004/11/15 14:45:16 vitroth 
Exp $) and
would like to know what is the "currently stable release" and also the
"hopefully still under developpement release".
Can it be considered safe  to upgrade from release 1.10 to release 1.22 
from CVS ?