What is the crowd's opinion of Nutshell CRM?

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I have few enough customers that everything is in a encrypted excel spreadsheet and I use Trello for tracking.

However, one of my clients though has a ton of clients himself, and he is extremely picky about software being easy and the features he likes. I know he has tried a bunch in the past, but loves http://www.nutshell.com/ Anytime a call comes in, he has that up so he can see everything he needs from past conversations and add in all new.

I liked the flow of it, just doesn't suit my needs.