I love that my doctor is able to show me how he would like for it all look in real life after surgery, which helps with decisions about what implants will be best suited towards your face shape/shape etc! The 3d images can sometimes feel misleading (especially when they are not 100% realistic), but this isn't really an issue as long you're happy enough wih them knowing exactly where things should go.
This was most helpful during consultations before we had any idea if our faces were suitable or whether certain procedures could work well together - just seeing different options helped us make informed choices along those lines rather than having no information at alo!!