The ease of use! There really isn't anything to dislike about this product; it is very user friendly which makes my job as an event planner so much easier than trying to navigate through something that's not quite intuitive enough for me yet at least (and I'm still learning). It has also been great having multiple ways in order to communicate with our current clients/customers who have joined events using Meetup vs others like LinkedIn Groups or Eventsbrite etc - now we can reach them all easily without needing separate accounts across different platforms just by logging into one account where they are already connected!!