First of all, I am a total geek and really get deep into the majority of programs. That being said, if it doesn't feel good in the first few minutes, I'll move on to another one. This one has a great feeling to it. It feels light and nimble.
The fact that you can so easily change info about a contact/company and have it feel more like a spreadsheet than a normal CRM is awesome.
The program is highly customizable, which I love. This lets me do what I need to do and change things as my company changes. It is also easy to customize, not weird and challenging to understand.
The current version doesn't have tags as part of it, thus far. There is a workaround, which I'm using, but I am from a CRM where tags made my life and filtering easier. I wish they'd offer it, even if it is part of the customizability features and not a part of the main program.
If you want easy to use, yet powerful (not too watered-down like Zoho and others) then this is what you want. It is not planning to help with marketing as much, so please make sure you're aware of this as it will not be your Aweber, Mailchimp, Mailerlite, etc. replacement. But it can integrate with them.
It makes things easier and allows me to automate. I haven't fully used the automation features, but the roadmap means for big things there to help with better business ease.