Failure rate higher than surgery. Expensive in the long run because of the need for more post treatment MRI and followup. In other words, you know nearly immediately the results of your efforts. If the tumor was completely resected, then you know the tumor is gone . If the nerves were saved, you know they will remain safe.
Recurrence is rare.
Risks of anesthesia and surgery apply. Post operative recovery period required. Depending on where the tumor is, there are 3 types of surgical approaches. Through the inner ear - Safest in terms of facial nerve preservation, and require little to no brain retraction to get access to the tumor. Used when hearing is already damaged or for very large tumors.