Before my RFLKT died, I used Cyclemeter exclusively. I now use it for my Live Streaming and data warehousing. When I used it, I did several century rides with it, including 3 cross state rides. Never had an issue with it locking up on long rides. One thing that some people tend to forget is that these cycling apps totally rely on whatever phone they are installed on and/or what other apps are running concurrently with the cycling app. If you''re going to do a long ride, I would suggest, if you aren't already doing this, to force close all other apps and turn off notifications and location services to apps that don't really need it.