New to Strata Design 3D CX 6.0 is the addition of guides. These line based constraints give you much more precision for modeling and positioning. Using the Guide Tool you can place guides along edges, between points on two objects, centered on an object face, etc.
The Grid Tool has been improved in several ways in this release. As before, you can draw in grids using the click and drag method. New to 6.0 are a two click and three click input method. A grid plane is drawn into the scene intersecting the click points you create.