Most of the features of upper-tier ESPs at a fraction of the price.
A lot more self-case and feeding than a hosted ESP. Cost is a bargain, but support and feature set definitely suffer from being low-cost alternative.
Email newsletter and bulk sending engine for high volumes and multiple brands.
Has a wide variety of targeting and segmenting abilities.
Not intuitive at all. Way over thought: takes many clicks to do simple tasks. Seems to use general email terms incorrectly so difficult to find what you are looking for. Expensive.
Marketing to opt in list. No benefits realized, only costs.