If you can tell me things I really should check out and care to explain some premium-only stuff that's cool, please go ahead
I have Crunchyroll Premium and, for the most part, I'm happy with it. The main difference between it and a free account is mostly ads and deals for the Crunchyroll store. For $6.95 a month it ain't a bad deal.
Shows I recommend are
JoJo's Bizarre Adventure
A fun and over-the-top action series based on the manga by Hirohiko Araki. The story is broken up into parts (8 parts currently on-going) and details the adventures of the various JoJos. The current anime covers the first three parts: Phantom Blood, Battle Tendancy, and Stardust Crusaders, with the forth part coming sometime in April.
Shirobako
An anime about making anime. If you want to learn some more about what goes into making an anime then I highly recommend this. It features a refreshingly diverse and enjoyable cast that you find yourself rooting for.
Some other recommendations:
Monthly Girl's Nozaki-kun (great comedy)
Shin Sekai Yori (haven't watched it yet, but i trust the overwhelmingly positive response from Animegaf)
Hunter x Hunter (an awesome shounen)