The good things: my back is still in great shape. I'm sleeping better (i.e., at all). I have more energy.
The bad: I have not only not lost any weight, I've gained a few pounds, even though my legs are considerably more cut. My face is breaking out from all the additional sweating. My skin is dry from 2+ showers a day.
All told, the goods outweigh the bads by a considerable amount. I'm giving myself 8 more weeks to reach my speed goal of 6 MPH, although knowing me, it won't take that long. And after that, I start upping my distance.