That they are able to provide us with a complete suite of features, from pre-sell follow up emails to multiple offers in one email blast. The ability for me to schedule my campaigns on their platform is also very helpful, and they have the best customer support out of all our vendors, which is essential in this industry. I cannot think of anything that we dislike! We have been using OptinBox for a couple years now for both client and client/retailer communications. They offer multiple ways to optimize marketing efforts, including retargeting, lead nurturing, and sales lead generation. We use their products for everything from lead nurturing to post-sales reminders, and it has never let us down. Their analytics allows us to track how many people open our emails, what pages they view, and what actions were taken (such as opening the.