I like the random trees, especially the tech ones. I also think that the eurekas revealing the place of the tech on the tree actually makes sense. Civ is not a historical sim; it's more of an alternate history. As was pointed out, the development of specific technologies was often random, but also, the development of certain techs often led to trying to discover specific uses for that tech. Hopefully, the random tech tree will somewhat simulate this. There's not guarantee that a specific tech will be discovered, but a eureka would give you an idea that something was out there, and you might want to start researching toward that even if you're not sure what you're going to discover along the way. I think this pretty much sums up how much of the developments through history have occurred. And, at least so far, since we haven't actually played with this on, I think this is another great addition to the game that I will enjoy playing.