Customers report high levels of deliverability over extended time horizons; appears to be one of the strong suits of ExactTarget
ExactTarget is not the simplest tool to be using - it is bloated with a lot of different options and the interface is far from intuitive when stacked against competitors like Mailchimp
Delivers valuable analytics but nothing better or worse than other providers
Well-integrated with a lot of plugins for tools like Salesforce and Omniture; built-in functionality not necessarily on par with other email marketing providers
A dependable customer support team; expensive pricing but more built for larger enterprises than other email marketing providers
VerticalResponse follows the same practice as other leading email marketing providers: feedback loops, unique IPs, Anti-SPAM compliance
VR offers industry-standard analytics with respect to deliverability, clickthroughs, and more.
VR is somewhere between the super simple platforms and the complex email marketing providers. It provides a lot of integrated tools and functionality, but it is not as quick and easy as competitor products like MailChimp.
VerticalResponse is probably one of the most robust providers with the most extensive feature set. It allows hard, technical functionality like selling tickets to an event through their email platform, to more aesthetic challenges, like crafting unique action buttons to become very simple actions.
Not especially known for its customer service; lacks a free plan to compete with companies like MailChimp, but on a per-email basis, far cheaper than others, starting at around $0.015/email - which is less than half of what MailChimp charges under some of its plans