I'm on one of the Voyager B9s now, and I must say I'm very impressed (at least with 6179).
There's virtually no rattles other than one coming from the cab, they're quite comfy (despite the seats not being too clever, but still better than the seats on the E200/E400s!) And they've got plenty of power, they're seeming limited to 50, but I get the impression they can go much faster. Certainly didn't struggle on the banks from Bishop to Durham like the B5s do
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6x ex-Lothian Buses Volvo B9TL on loan from Ensign Bus