The Blend tool or also known as Sublend by an unknown author is a great tool to morph objects together. This tool makes creating solid surfaces connecting other surfaces easy and as simple as a click. This is great for complicated designs such as contours of a car or creating specific curves connected by definite bounds.
The tool has many options and after a few test runs it is easy to grasp and start using. The great thing about it is that the objects stay entangled, so you can make adjustments to the model to get it exactly as you like it. And once you are happy with the outcome you could separate the shell away from the morphed steps. The use of this plugin is presented much better in the youtube video below. Though, it is sometimes tough to get the object just right and it tends to rotate the morphing and loading time takes a little while.
Overall, the Blend tool is amazing and helps designers create models faster and more precise than ever. At the time of this review the Blend Tool is free and is available at this link. I give this plugin 5 out of 5 stars!