It's not too bad, really! Provided the trains are on time. And the fact that it takes away from the freedom of a bike only commute. As in, the thing I love about biking is that it's all up to me. If I leave on time and my equipment is maintained well, there's few things, short of a flat or crash, or a similar unforeseen condition, that will slow me down. And if I need to go faster I go harder. Absolutely love biking past a good traffic jam.