I like that they have an easy to use dashboard, which helps me manage my campaigns in one place! They also provide great support if you need help with your account or questions about how their products work as well!! The only thing i dislike from prefinley was it's pricing model - It can be pricey depending upon what type/size campaign we're running (if any). We've used them mainly because our previous agency no longer works w us but haven't had much success using Prefinleys services so far- other than some minor tweaking around email templates etc when needed :).