Excellent! Excellent warning system with useful average speed notification. I run it in background and have Satnav running on the screen. Good customisation.
Does what it says on the tin works great on my HTC Desire and with copilot live I get directions and speedcam warnings. Was worth subscribing to as twice this week it warned me of mobile vans so I slowed down and round the corner was the the nasty yellow van man, I smiled as I drove past at 29 mph!