A forum like this is unbeatable. First, you get a much better sense of the hobby, and hear of problems, good ideas, and what's happening over a much, much larger part of the hobby than you could every hear about in just one local club or at your loco LHSs.
But as you say, the friends you make are the best part. I have met several people from this forum in person and started some really nice friendships. The many others I like and respect and hope to meet, also, some day.
