You get to lord it over the basic members as if you're a better person and they are theives stealing all the chess from righteous upstanding people.
There are other benefits in live chess, I think you can play in multiple games and stuff. But it seems to me that the first thing is used far more than any of the others.

I just think Diamond is better only due to the idea that you can do pretty much whatever you want on here and it's unlimited. My girlfriend went from Gold to Platinum just do to more Tactics Trainer and have access to more TV shows, since also she is an Admin of the Chess.com/TV Group, so it definitely helped there too.
What does premium membership offer in the way of live chess that basic doesn't?
I'm pretty set on upgrading, just trying to figure out what type of upgrade suits me best