Not to berate this service (I think it's a cool use of the data), but I have difficulty perceiving its value. I see this saving you ~15 minutes if there's a delay. A big deal if you have an interview or business meeting, but does it matter much otherwise?
I'm probably in the minority (especially in London), but in most cases punctuality is not something I stress about, whether I'm doing the travelling or someone else is. Disclaimer: I was raised on island time.
I work a bit out of town, in Walton-on-Thames, and need to make a connection in Woking each evening. Four minutes late adds thirty minutes to my journey, and seeing which trains are routinely late, day after day after fucking day, despite the fact that there are effectively no trains on the track ahead of it (this section of track has four lines, two fast and two slow, so the slow train pretty much has the line to itself) is massively valuable.
I'm probably in the minority (especially in London), but in most cases punctuality is not something I stress about, whether I'm doing the travelling or someone else is. Disclaimer: I was raised on island time.