Yeah the 145s seem to be reliable on it. Though I'd give myself a good bit of time getting to Heuston anyway what with the difficulties of buses getting onto the quays from westmoreland street, but I'm sure you've discovered that anyway.
I presume the app is based on the same data as the real-time street displays. I believe that these use GPS data to estimate the arrival times of vehicles. As such there must be some margin of error. For example I've seen buses on Dame Street within sight and on the display as "due" taking another few minutes to arrive at the stop due to local traffic congestion. Even with such inaccuracies the displays (and presumably the app) are a big improvement on the old system of pot luck!
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