The second DVD is an almost completely different movie. I was shocked.
Cannot talk about it, cause I do not want to spoil the extra bits for those of you who have not seen the 2nd version yet.

I am about to watch it for the 2nd time today, followed by Omega Man.

The second version of the film reinforced my belief that this is THE movie that Omega Man fans have been waiting for, for the past two decades.
While the Ridley Scott directed version starring Arnold would have been sweet, these guys did an incredible job. Got chills watching the 2nd disk, just like I did in the theater with the original.