I saw a ghost twice in my life. Believe me, it is the creepiest feeling. Don't want to see another one of those for the rest of my life.
I saw one as a child, but can not tell you much about that, as I was too young to be able to explain. The second one I saw was at 9:15pm in my home a few years ago, around the same time an uncle of mine died. We received the phone call the next morning telling us that he had died. At that very time.
I don't consider being visited by a ghost a blessing. Just my opinion.