The older Streetlites (ex Drifter and the shorter Saltwell Park examples) both had a higher limited speed as well (58 rather than the usual 50). I would be interested to know how much more life GNE think they can get out of these (and how long will they actually last)?

The Mercedes engined ones, I found, tended to have more power and coped better on hills. The Mercedes ones also seemed to have smoother gear changes unlike some of the Cummins ones which randomly had whiplash inducing gear changes.

The only other type that I've driven with bad rattling and vibration when idling were the Arriva Durham E200s.