MyFico if you use it right will save you the $50 and more if you "Play The Game Right".
This is how I keep track, in the same day I pulled my FICO score's from here I signed up with TC and got the FACKO's. I compared them to get a rough idea the differance (about 40 points because of inquires, and miss stuff). I watch my CR and Scores on TC to keep track of where my scores are and I figure if my FACKO goes up 10 points my FICO prob jumped 15, that's just in theory. When I am seeking new credit, I'll pull my FICO's go to whogavemecredit and make a list of who will do business with me using my State and CRA's FICO score. I've been able to aquire $6000 in unsecured CL's takeing my UTL from 60-70% down to around 15% just with the new CL's. My FICO took about a 20 point hit due to the New Accounts, but as they age I'll pay the 15% UTL down to 2% and in 6 months my Score will have jumped 70-80 Points. That will put me in a whole new bracket when shopping for a Mortgage, prob saving in the neighborhood of $200 a month.
So to answer your question, yes I think it's worth it, but not if you want a daily report. I would go for the FACKO score to keep track and only use MyFico when you are about to make a purchase, or apply for new Credit.