For openldap 2.4 the contrib/autogroup overlay is the only one which can reliably offer dynamic groups that work with memberOf. So it is basically a must-have if you want to work with dynamic groups without restrictions. In openldap 2.5 the official dynlist-layout seems (according to the beta' documentation) to gain the ability to also offer memberOf-capabilities. So with a switch to openldap 2.5 this might become obsolete.
But for the time being, this is in many cases your best bet for dynamic group setups.
For openldap 2.4 the contrib/autogroup overlay is the only one which can reliably offer dynamic groups that work with memberOf. So it is basically a must-have if you want to work with dynamic groups without restrictions. In openldap 2.5 the official dynlist-layout seems (according to the beta' documentation) to gain the ability to also offer memberOf-capabilities. So with a switch to openldap 2.5 this might become obsolete. But for the time being, this is in many cases your best bet for dynamic group setups.