I love the personal touch and quality of support from the Founder, and the power and flexibility of the platform, whether that be in list and campaign management, or the awesome Bot Activity feature that determines whether opens or clicks are likely to be caused by email software, and not real human interactions. What you get for the price is unmatched.
It has a great human touch, everything is very intuitive and easy to use - it's also fully featurded and all the things you need. I use it every day and it's easy to connect to all my tools. Love it.
It has very simple list-size based pricing, and you get all the features no matter what. The email marketing piece is great by itself, but when you layer in Flows, you can take the automation of your marketing to a whole other level. The support is also personalized and community based, which makes getting help very easy.