Here's my two cents on the Double Deckers. They are nice buses to drive, they turn very sharp and you barely notice the top deck while driving.
However, I feel they need some adjustments done. When the rear door is open the driver monitor only shows the rear door, I wish it showed the top deck so I can see when everyone who wants off the bus is off and it's clear to load passengers. Also the door controls are sensitive, the doors will not close until the bus is fully raised from the kneel position and the brakes are applied, the brakes having to be applied I can live with but sometimes I jump the gun and close the doors before the bus is fully raised. This makes the double deckers bus slower to operate.
I had some issues with the rear doors freezing up while closing, it happened to me on three occasions and I ended up having to BO the bus and get a replacement. And I had an occasion where the rear door would not open when you push the gray bars despite the rear doors being activated.