I find GR contacts are very unreliable - not sure why though, but every person I've connected with via there has been a bit of a let down.
Tracing my Evans family (a joy in South Wales) came up with an unexpected message from a GR contact - turns out that a distant cousin had just started tracing their mother's side.
They asked me if I was related to X, Y and Z (who were not on my tree, but were part of the family), so it did confirm this was the correct person.
Opened both trees up for each other - they had very little info that I didn't (in comparison to all my names and dates!), and then never replied to another message.
I'm unsure whether their subscription had lapsed, or they simply were not interested in exchanging further info once they had what I had posted (which wasn;t half of what I had at home!) - their loss