Really a must have!  Great for both rabbiting and dados up to about 5" from the edge.  the dust port only works for rabbiting but when used works well.  the device would have received five stars if it didn't make the router so unstable when setting down.  After you make your cut the round dust port causes the router to tip over, once almost rolling off the bench.  This would get a solid five stars if they included stabilizing legs.  I'll have to drill and figure something out.