I have done it and yes its worth doing.
Reasons
-all apps are free.i have never bought any apps ever.
-i can connect sd cards to my ipad. Im travelling with 80gb of videos music n books.
-third party apps from cydia that make ur ipad much more functional, ie save videos..etc
Cant think of all the reasons but if you google "reasons to jailbreak ipad" you will find more info.
Do let me know if you have any other questions..