My first marathon, the Route 66 in Tulsa in 2009, was my only race so far that offered runner tracking. Some of my friends got texts at a couple checkpoints, some got them at others, some got them out of order... in other words, it was a mess.
Let's see if things go more smootly at Cowtown on Sunday. You can track me at 10K, 13.1 miles, 30K, 26.2 miles and the ultra finish. If you didn't do what I did -- drop all your data subscriptions to spite T-Mobile until your contract runs out -- I don't think the service costs anything. Depending on my mental state, you might find out that I finished before I do.