Great App, and getting better with each update.

It seemed to give quite erratic data at first, but the lastest version is working quite well for me. I use it to plot out some of my bike rides, and its pretty neat! At the end I get a plot of my speed vs. time, an elevation profile with cumulative elevation gain, and a map of where I went. These can all be viewed right on the iPhone and also uploaded to Google Docs where you can import them into sites like Mapmyride, Routeslip, etc.
I would like to see a real-time percect grade while climbing or descending a hill. A more customizable "dashboard" page for current data (like the GPS Kit app) would be nice, too. Only downside is decreased battery life. I doubt it would last for an all-day expedition. Also, using the iPhone for anything else stops the data collection.
Still, theyve done a great job with the app and the regular updates. Well worth the price!

RPNtys about iTrail