Let's take the 5 examples on arriva x1 service. Every week there is problems with multiple even though there is only 5. Within the past 4 months there's probably less than 20 days where all 5 have been on the road. 1594 is currently on at least it's 3rd engine and is constantly having troubles with overheating and no acceleration. 1593 goes well however this also has troubles on a weekly basis. 1592 seems to be the best one of the batch, with it being the fastest and having less reliability issues than the rest. 1591 & 1590 on the other hand are dangerously slow, and struggle to do 45mph flat out again with these 2 having problems on a very regular basis. Not to mention the fact that the drivers absolutely hate them as the are horrible to drive and they would have a pulsar or a solo any day over a streetlite.
Oh and 1 arriva Stockton driver had to go on long term sickness leave due to bashing his head on the back of the cab compartment as the gearbox became confused and over revved violently shaking the bus causing him to whack his head with a considerable amount of force

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