The Search Symphony virus isn’t regarded as highly dangerous, since it doesn’t aim to harm your Mac or your files. However, if the Search Symphony virus remains in the system, it may eventually put your Mac at risk of getting targeted by more serious threats. The problem with browser hijackers like this one, in general, is that the content they typically promote is not particularly reliable and could sometimes be unsafe. If you have Search Symphony on your Mac, you will probably be getting bombarded with obstructive and aggressive online advertisements, and you may even experience automatic page redirects to some of the sites that this hijacker is trying to promote. While this activity is more annoying than dangerous, it could still land you on some unsafe site that may be designed to scam people or to get them infected with actual malware viruses (Trojans, Spyware, file-encrypting Ransomware, etc.). On top of all this, there’s not much that Search Symphony can offer you to make keeping this software on your Mac worth it. Considering all this, your best option truly is to delete this hijacker and restore the regular state of your browser/browsers.