Originally Posted by bdcheung

The Ergomo, on the other hand, allows you to exit "Interval Mode". The Powertap, by my experience, doesn't. Once you start an interval, you can't stop. You also can't stop one interval without immediately starting the next (i.e. on the PT, when you hold down both buttons to stop Interval1, Interval2 starts immediately). With the Ergomo, you can stop Interval1, recover, then start Interval2 at a later time.