The ease of use, speed in finding people you need to get things done with! I don't have any dislikes about using sword fish as it has been incredibly useful for me so far when searching my contacts list from work or looking up clients that are not easily found elsewhere online (such as LinkedIn).
There really isn’t anything specific i dislike at this time however there could be some features added down the road which would make our lives easier if needed but nothing majorly disliked currently either. Try them out - they're great!! We've used several different ways through other companies where we can find someone quickly such as phonebooks etc., these were always very slow compared due their lackings/overhead costs associated.