Agile is really simple to use, as with all CRMs it is basically a big address book with the ability to add notes and track deals.
It does this really well, and if nothing else the ability to keep this data well organised, tagged and updated will be enough for some users.
Where it really shines is the marketing automation features, some other reviewers have criticised these features but I feel they are being unfair.
We have contemplated other MUCH more expensive platforms and Agile won on price and features, that you can have 10 users for free and a single marketing automation or campaign allows you to test the water.
To maximise the CRM you need to:
a. Add tracking to your website
b. Add tracking to your emails
c. Add a form to your website
Once you have done this it provides great usage data on what prospect is looking at your site.
I have never found a bug, and I use it a lot for my own use and my partners business and we recommend it to all our clients.
We previously trialled One Page CRM, Pipedrive, Highrise, Insightly, Salesforce and several other packages and this one is by far the best for our needs.
The email sending features replace MailChimp and the landing pages are really handy as well. It may not be as good as Mailchimp for certain actions but being integrated has its advantages.
It works straight out the box - some minor config is required but it doesn't take long.
It has an amazing browser extension that let's you add contacts direct from the search view of LinkedIn
Finally support is awesome - a number of times I have thought their was a bug but it was actually my error. The support quickly showed me screen shots on where I went wrong.
Not too much:
1. It doesn't interface with as many other applications as I would like it to.
2. Sending emails even on the paid plan has sent by agile in the footer.
3. You can't send more then 25 emails unless you set up a campaign, this is a pain but not enough of one to devalue the tool.
4. You can't add an attachment to a campaign, only a link or a picture. Again not a total deal breaker but a tad annoying.
5. Setting up an email template and editing a campaign feels a little clunky.
Organising and managing clients, ex-clients, prospects, and all our leads.
It has allowed us to market to our existing clients and track clickthroughs from campaigns.
I would highly recommend you try it, as unlike a "leading" automation / CRM vendor who want a years fees upfront Agile is free for 10 users and a limited feature set.
We market better, we manage prospects better we have great visibility.