90-95% success rate sounds about right. There have been claims about cyberknife being better for hearing preservation, but I am not sure how well documented this is yet. You should also know about all the options. Surgery is also a good option. And in some cases Wait and Watch is a good option. I would first educate myself on the pros and cons of the options. It is not a bad idea to get several opinions as well. This is not to push you away from radiosurgery by any means, it is an excellent option. Only to have you be fully aware of all the options available to you.
Very important - how many has the prospective doctor done? On this site, ANA recommends going with doctors who have extensive experience in AN treatment.
PS: Feel free to PM me if you want.