I gave Runkeeper another test on my ride tonight and I'm offically impressed!
I'm going to do a full review soon, but I will say that (so far) it is the best iPhone GPS cycling app I have used. And I have used a lot I can tell you!
Graphically it looks much nicer than MotionX, though I have my iPhone in my pocket recording so it is not a big deal. It feels polished, even though MotionX has more features (not that I use them all anyway).
So far it has tracked my route just about perfectly. Which you can see below: