What do you like best?
It is nice to see a picture automatically pulled in to the side of the email pane from the contact's LinkedIn page, and the mutual connections are also a nice touch.
What do you dislike?
This isn't really a "dislike", but unless I'm missing something, it doesn't seem like it does much more than show me a picture and a few mutual friends. There's nothing wrong with this, but it doesn't do enough to make me want to recommend it to anyone, it's just sort of there.
Recommendations to others considering the product
There just isn't that much to say about this. It doesn't seem to do all that much, but if it does what you want, then it is a great solution for you, as it does these things well.
What business problems are you solving with the product? What benefits have you realized?
This is part of the issue: it doesn't really solve a problem. I guess it's nice to see a picture and a few familiar faces on the mutual friends bar, but this wasn't an issue before and it doesn't really solve anything for me now.