People's experience using Hastings YouDrive, let me know!

Thinking of using Hastings YouDrive as it's HALF the cost of insurance that isnt a black box/telematics (at sround £1,000 instead of around £2,000-2,400) of the car I'll be buying myself (I've saved for years!!)

But I I worried if it is too harsh on your score and if it is accurate or not. What are peoples experiences with it? It is significantly cheaper than any other telematics/black box insuance too as the others are around £1,400 or so and non telematics is £2,000+