To be honest, I was very sceptical about using DNA to trace family connections, but one day I saw an offer and thought I'd give it a try anyway. I only really hoped to find out if I had any blood lines outside UK & Europe.
Like many of you I've been sent links, but the trees themselves seemed poorly managed or the person didn't reply.
However, I have had 2 results that have delighted and surprised me. The first one was from someone who told me which line I was related to him by, which gave me the clue I needed to find my Great Grandfather's family. He had been a brick wall for years, but it turns out he'd changed his surname, however all the other information about him matched exactly what I already had.
Also, a second cousin in the US contacted me. We had met as teenagers, but as it was our mothers who kept in touch, when they died we lost contact. We have since kept in touch, and have so much in common we plan to meet up one day.
So I guess the message is don't give up on it. Someone might contact you in time who is worth following up.