Ive been using the app for over a month, I logged about 400kms so far. Its been flawless since day 1. Im using it with a Wahoo Bluesc to get cadence and reliable speed metrics (instant speed readings are not very accurate without it). Gps directions have been invaluable while exploring new paths, and when riding in groups. The customizable ui shows you just what you need. The web site is the best mapping tool Ive ever seen, how did they manage to make it better than Googles? It really is perfect for me. If you have a smart phone there really is not much need to buy another gps unit like garmin, use the one in your phone and save the money. The only downside is phone battery life. I can get about 2 hours of riding with cell data off, on my 2 year old iPhone 5. This means I need to carry an extra portable charger on longer rides. Ill probably find a way to permanently connect one to my mount at some point.
Cricri from Canada about Ride with GPS: Bike Navigation, v1.3.2