It's great. It makes me feel awake and alert all day at work, it gives me a good excuse to be outside even though it's winter, and I know that I'm getting a healthy dose of exercise. I highly recommend it for anyone who's got the option.
Only two disadvantages: 1. given that it's winter, I have no choice but to wear shoes. Hopefully in a few months that won't be a problem anymore. 2. total commuting time is an hour each way (as opposed to the 15 minutes I'm used to). That sucks up a lot of time. Speaking of which, gotta go.