Wedding Wire rsvp Tool

Who has used this and was it successful
or did it end up being more of a headache? I was recently in a wedding where the bride did her RSVPs through TheKnot and she loved it, so I was thrilled when I saw that WW offered the same thing. However, I noticed today when I tested it out that it pulls up everyone on my guest list with a name that “sounds like” the name that was typed it. Even if you used the person’s first and last name. This is going to be a huge problem since 70% of our guest list is family, and individuals who share the same last name. Is there any way that you can set it to just THAT specific name shows up? If not, I am worried that we will have to go old school and have paper RSVPs which I was hoping to avoid since our guest list is topping 250.