Andrew,
I don't have the Neptune, but I have two Saturns. Same core (inverted in the Neptune, I believe) but the Neptune is a pearl coverstock and the Saturn is solid.
I would say the Saturn is anything but weak. One of them is drilled pin 5" from axis, CG at 30 degrees, no weighthole, surface at 2000 Abralon. On a medium THS with 38' length (buffed to 40'), I will use this Saturn once the track area is starting to burn up. It is still pretty strong.
I have considered picking up a Neptune and would put the pin 5-1/2" from axis. I'm very satisfied with my Saturns and I also have the Venus (same core, pearl particle coverstock). Overall, a lot of bang for the buck.
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Hook 'em Horns!
Tag Team Coaching success story.