We are a small firm of 3 users. This was easy to install on the domain, it was easy to distribute to my staff, it is easy to use and syncs perfectly and quickly. I can add a name in one I hit save it is almost instantly available to staff. During my free trial period, I had question about pricing since I was only needing 3 users, but minimum is 5. Someone from Shared Contacts Email contacted me quickly to answer that question and followed up with several emails with tips. I asked several questions with this person over the trial period and they responded quickly. That was a very nice surprise. Even though I only need 3 users and I have to pay the minimum of 5 users, for convenience of sharing a contacts label is well worth the price to make sure me and my staff of 2 always have the correct contact information.
I've seen some of the 1 star because of syncing issues. We have not experienced that. If we do experience as some say happens later, I will be back to comment, but for now I highly recommend