I have bought about a dozen of the top cycling apps and this is hands down my favorite and best looking of all… probably one of the best looking apps no matter what category. Extremely well thought…. large numbers of whats important; uploads to common sites. Eventhough some people love absence of colors, color do make a difference, especially in your HR Zone - gray, blue, yellow, orange and red. Youll know where you are with just a glance. I would add customization to the fields like what you have in the Garmin Edge 800 to split speed and cadence on the top and display miles in a large number for the rides where distance is more important - that would make it even better. Latest version is stable and has not crashed or locked up. A very nice feature is the ability to add routes but I havent found how to add them without connecting the Phone to iTunes via USB.
If you have a Wahoo case, this is the app to get. Clean, beautiful, useful.
Note regarding daytime visibility: it helps if you add an anti-reflective screen protector to the CASE (not the phone) until Apple makes a trans-reflective iPhone screen or uses some other future technology. In the mean time, the screen protector works better than the reflective case screen. Several companies make generic shields that you can trim to fit.