I have the Nexus Maximus and we've used it for years. It's a good, solid toy. I also have the Feeldoe More and it's a touch easier to use without a harness because it's less bendy, but the nexus toy is more comfortable.
It depends on which person (or both) is the beginner.
If the giving partner is the beginner, the Nexus has a smaller dildo for the giver but its harder to hold in than the Share.
If the one receiving is the beginner, the Nexus has a pretty big dildo on the receiver's end.