This was one of the highlights of our trip. The tour guide was extremely knowledgeable about Brooklyn's history, architecture, current events, and future plans. I just can't think of another way we could have gotten to know Brooklyn better than by biking through it with our tour guide.
Pros: Tour guide was great. Bikes were in great condition. Tour started on time. Beautiful views and lots of knowledge gained about Brooklyn.
Cons: I think the only thing the tour guide could do better was listen to his clients desires a little better. We were a small group of 4. There were a few times where he would point out something, (best place to get key lime pie, for example), and despite multiple comments made that made it clear there was interest to stop and try it, we kept going. This wasn't for lack of time as the tour ended about an hour early.
Be aware, this is NOT a grueling bike ride at all. This is very slow paced. For us, I think it was the ideal pace, and it gave the tour guide multiple opportunities to stop and point out some really cool things. But if you're an avid bike rider and are looking for something a little challenging, this may not be the tour for you.