Their support team is phenomenal! They are always quick to respond back when you need help or clarification of anything.
The pricing structure was perfect for our needs at that time (and still very reasonable). I have used several ad page providers in my career but this one has been by far the most helpful so it's hard not to recommend them all around! Not much else - haven't really run into any problems while using their service. We were able to use their services because we wanted something less expensive than other options out there but they also had great features like analytics data segmentation which helped us figure out what type of content works best for each user group.