It's a solid CRM with a nice GUI / User interface, stable, US-based support—Insightly is headquartered in San Francisco and all support is there—and some nice integrations such as:
iOS and Android
Their pricing starts at FREE, but even their mid-tier package is just $35 per user per month on a monthly basis, or you can pre-pay and bring that down to just $29 per user per month.
It is lacking in the area of email marketing as well as marketing and workflow automation—which are features that Infusionsoft does quite nicely—and I cannot over-emphasize the need to implement processes and automation into every aspect of your business.
That being said, if you are just starting out and you need a great CRM that is built around and for small businesses, Insightly is worth your time and consideration.
Below is a quick video I did from my own free account that I just created along with some screenshots from the demo I received from Insightly today. I hope this helps you make an informed CRM / email marketing / marketing automation buying decision.