It really depends on how you use LI, and what you plan to do. I do sales/business development, and my company pays for the premium account. I've found it to be helpful, especially when reaching out to strangers to arrange meetings at conferences and finding the proper person to speak with at a target company. However, if I had a different role or was paying for it myself, I probably wouldn't use it.
Re: Is LinkedIn Premium worth the $$ ?