I've been a user of Evite for a decade. But a recent experience caused me to move to another service. Basically, Evite caused me to stare at large images of the evite card options along with advertising. It's not so much the ads, its more the tedious process of moving forward to see more options. I was seeing maybe six to a page. I want to scroll through the options, not click forward and see only a few at a time. I know what I am looking for and I want to quickly click through. Couldn't do that on Evite and just grew very fatigued very quickly. Like when I go to Shutterlfy or Tinyprints for holiday cards, I can scroll through many options. On Evite it is very different, I could barely see more than 4 to a page plus a big banner ad in the middle. Also the top of the Evite screen would lock to further reduce real estate.
Found another site which actually had some slick features, so it worked out.