ThomasElliott
Old School Hero
Mine's just 6 miles each way, but at least half of the way there is uphill. I tend to prefer using my road bike (much more fun bombing down the hill on the way home with than a 26" wheel MTB), but have in times of need relied on my suspension-less Koga-Miyata Terrarunner to do the job as well. And yes, being able to shower and change at work helps immensely!