Most all the other pullover type machines are very good. As long as the elbows lead the movement. That is, resistance on the elbows. Main advantage of the original pullover machine was that three phased cam that followed the natural strength curve (from the weakest to the strongest) and made adjustment accordingly. Art Jones got that ideas from working with chains, at first, and the changing levels of strength during just about any exercise. In simple terms, just lifting a chain from the ground, more resistance is encountered from each chain link as it is raised up. Roughly following the natural strength pattern of the muscles. One of the reasons that chain training (and elastic band training) is used with some advanced PL'ing workout plans.
The only negative factor about Nautilus training (pullover, shoulder, hip/back, arm, leg machines, ab, etc) is that the strength gained, and it can be impressive, does not transfer back over to regular BB training. You may use huge weight on the bench/chest machine but going back to regular bench pressing you will find your not nearly as strong as before using the Nautilus equipment. You almost have to retrain the motor units to bench press properly. If you were BB rowing 260, did the pullover machine for three month's (for example) chances would be that you would have a tough time rowing 220-230 for reps after. Muscle size yes, transferring of strength back to regular free weight (hate that term) training, no. Probably partly due to the arms and other supporting pressing factors not brought into play when doing strictly Nautilus programs (motor units again). Combining both forms of training in one workout may be best if keeping BB strength matching. Good luck.
Side Bar: Is that brother in the pullover machine Mercury Morris of the old Dolphins?