cyber knife - cure for cancer?

Has anyone out there heard of the cyber knife ads a cure for cancer or has anyone had an experience with it for themself or for a loved one?  My husband is about to meet with a radiology group to discuss this..as you know sometimes we don't get all the information we need to make a decision as to whether this is for us or not..my husband has been having chemo that has apparently stopped working and this is another choice for us or maybe a clinical study.  Anyone have any advice etc.   Lucille Noble (lnoble@weichertdunhill.net)