When completely new there were problems with the door firmware. I commuted via bus at the time and often got late because the bloody doors would crash. It got ironed out though, and the buses were really nice at that point. After a couple of years though, they’d start wailing like banshees, it was pretty horrible. I’m thinking that’s why they replaced them, but I honestly don’t know.

All that said, they were better than the diesel buses they replaced. Nicer, more spacious, less noisy.