This way a blast! My wife and I did the two hour tour on 7/13/13 at 8pm as a part of our weekend getaway.
Dan and Sarah did a great job with the tour. The only downside to the tour is my feet started to hurt after a little while. Just keep moving your feet and picking them up a little as your navigate around the city streets. Sarah did a great job blocking traffic but be sure you also keep a look out for those crazy Pittsburgh drivers.
I hope to do the four hour tour the next time we visit Pittsburgh.
Be sure to show up 30 mins before you schedule tour start time. This is to sign the release forms and get familiar with Segway before you actually start the tour. This is very important or you will piss off the rest of the people in your tour who showed up on time.