This turned out to be a pretty good way to get around London and see some sites when we first arrived. For the most part, the buses ran on time and weren't packed with people. The drivers were nice and answered our questions.
The audio headphones worked quite well and even with the occasional rain shower, we mostly sat up top and enjoyed the view. We did move to the up top covered part of the bus as soon as possible, though.
They have different lines that go to different parts of London so that was a little confusing at first.
There's lots of traffic, but overall, we had a good time while on the bus.
We also did the river cruise as part of the Big Bus package, and it was fun and educational, even though it was a little cold out on the water that day.