I'm very happy with a Horizon T4000 - it folds, which is handy, but seems pretty solid (it was herniatingly heavy to move the box it came in, but has wheels to help when assembled) and I've had no problems with it (several months of regular use, including a few 20-milers). No bells or whistles, but does everything I need (max gradient 12 %, max speed 20 kph). They are apparently permanently reduced from their "recommended" £1500 price tag, which, to be honest, would possibly be a bit steep.
• it behaves in a way that makes a person worried that it might injure them.
The law applies everywhere the general public is allowed to go and anywhere your dog goes where it is not supposed to be. The maximum penalty for allowing a dog you own or are in charge of to be dangerously out of control is two years’ imprisonment, or a fine, or both."