They've only been properly in service for a day and I want the 57 regs back! 

For some reason the doors only open/close in neutral, so that's extra idling time, the stop-start rubbish is rather annoying, as the lights flicker and the air con goes off. 

Rather sluggish on the high speed sections of route too, totally unsuitable for the X21/X22, and the various other routes they run.