I spoke too soon, my ES4 has developed some sort of fault. It feels and sounds like the front wheel is rubbing and it loses power, like the (electronic) brake is on while just riding along normally. it 's intermittent but frequent. If applying the brake while its doing it, it makes a hell of a grinding noise.
Anyway, it's back at the shop now for warranty diagnosis and repair, and I'm back on the bus. Be interesting to see how efficient the Ninebot warranty process is in NZ. I'll report back.
