I cycle nearly every day, often alternating between road and mountain. The first ad I saw for the Halfbike intrigued me as it seemed like an entirely different experience. After hemming and hawing over it for at least a couple months, I finally pulled the trigger and have enjoyed it immensely (even with one major wipeout on my first attempt.) I still haven't done much more than a 5k at one time but it's great for my city's (Salt Lake) biking paths. I now just keep it in the back of my car so I can pull it out when I have time for a short workout.