Clusters that Follow

One problem I have had with using Clusters in Maya is that if you parent them into the rig then you get a double transform on the vertices in the Cluster. But here is a solution I learned today.
1. select your verts, create your cluster
2. Assuming it’s named cluster1(default name), type in the following:

connectAttr -f cluster1Handle.pim cluster1.pm;

This will connect cluster1Handle.parentInverseMatrix to cluster1.bindPreMatrix.

3. Group the Cluster and then parent it into the rig.

The cluster will now follow the rig, without double transforming.