The ability to create custom fields for my users with ease of use! I love that it's intuitively easy enough so newbies can jump right in without needing any training or support from me at all!! There are some minor glitches here & there - but nothing major by far (and they're being fixed).
It works great overall though- just make sure you have plenty if time dedicated before launching into production mode because your customers will be waiting patiently while their lists grow exponentially as soon as launch day hits. Our goal was simple yet challenging--to provide our clients an incredibly accurate list which we felt like no one else could do better than us ourselves due to its size/complexity.- We achieved this through automation using webulla software along w other services such as Mail Chimp etc.-- This allowed multiple people within different departments across 3 states work together seamlessly towards achieving success.