I use the speed limiter (MG4 Trophy) because it's so easy to exceed the speed limits in an automatic electric car because it's so quiet. However,
Intelligent speed limiting has to be set up after every power down (this may change)
It has then to be turned on using the steering wheel button
The speed sign recognition is not reliable. It can pick up speed signs on side roads which may be less or greater than the speed limit. This can result in a rapid deceleration which is dangerous for cars behind.
It may not detect some signs.
It doesn't work from the navigation system which is probably more reliable.
It sets the National speed limit as 60 mph, even on dual carriageways
It picks up speed signs from nowhere! We have a 40 limit on on road near us but it reliably picks up 70 mph when there is no sign!
You can override the speed limiting by stabbing the accelerator pedal, but the acceleration is such that you will probably go way over the speed limit.