This was new about 6 months ago. It is a good deal for those with Sprint PCS and Sprint LD. The sign up page says new Sprint LD customers only, but I was an existing customer when I called and they gave it to me with no problem. After your free 50 are used state to state rate is $.07 and in state rates vary, mine are $.10/min.
They have added some fine print to the offer regarding early termination fees, etc. Read the fine print.