Never saw that before. Pretty cool, actually, but I prefer the film as it was released. Watching the film as a stand-alone, the future doesn't seem pre-determined in the way that it does with that scene included.
My mind still has difficulties understanding how the Terminator universe would actually operate. How could Reese be the father of John Connor, yet only become his father after John Connor sends him into the past? The action by Connor had to happen first, otherwise there would be no Reese to father him. But without Reese, Connor doesn't exist. . .then the Endo chip leads to Terminators being created, but the only reason Cyberdyne had it was because of a Terminator sent back through time. Would they have developed Terminators anyway without it? These are some of those. . .