If the Hailbike feels better, go for it. As far as whether to spend the extra 100 for the 3.0, at that price-point, you get a lot more for an extra 100 pounds. You are a long ways from the point of diminishing returns. I agree that the 21 vs 24 speed thing may not matter, but Tourney vs Acera does. If you can afford it, the extra 100, I would definitely go with the 3.0.