Shivering Isles offers some more fun and expansive areas of Cyrodill. In no way am I saying Cyrodill isn't big enough I mean oh my god is it huge! Shivering Isles allows you to join the psycho madness that is the mind of Sheogorath the Price of Madness and Insanity. The missons you get are fun and difficult, some are more demented and fun than others. It's nice that your not stuck in Shogorath's rhelm but that you can go back and forth between his rhelm and the rhelm of light(Cyrodill). This is a great place to level up if your a medium leveled person but, beware that you can meet your match here pretty quickly so pick and choose your battles and make sure to carry a lot of heath potions. All in all, this is a fun add on to the Elder Scrolls series and is a definate pick up to me. I got mine from the 360 marketplace for 2,400 gamer points(roughly about $30). Pick this up definately worth it if your bored with cyrodill.