Started with low expectations, but Tarvent has blown me away! Let me list a few of the things that I really rate about this software:

1) Very smart and intuitive campaign builder
2) Logical contact infrastructure, and powerful search/sort tools
3) Automation - this is top drawer. I came from GetResponse, and this is up there and even better in some areas. Massively flexible, but with a simple interface
4) Dynamic content - Wow, I was not expecting this! The ability to personalise your email not just with a name, but with a whole content block - super powerful!
5) Quick and responsive support - they genuinely want to hear about any negative points you come across so they can sort them - sooo different from other platforms!

Lots of other pleasing features and touches, I'm just scratching the surface of the powerful infrastructure, but so so impressed!