It's generally a good idea to replace the strut mounts when replacing the struts. Much in the same manner that the struts and shocks should be replaced together (when applicable), you should consider ...

Replace struts yourself and save $300 ...

Picture yourself sitting on a chair with one leg shorter than the others. Every bit of movement makes it wobble, creak, or sway to one side. It is anything but comfortable to sit in. That's kind of ...