RSA echoice car insurance

Br1gg5y

Its that time of year, were i am looking to renew my car insurance, my renewal quote was £300 more than what i paid last year, over £1000, so i opted to search around, money supermarket gave me RSA echoice at £401, then when i clicked more info it gave me £348. The best quote after that is Co-operative at £509. I've tried to google reviews for RSA echoice and cant find anything helpful, so my question is why are they sooo much cheaper than anyone else, and does anyone else use them, if so would you recommend?

Thank you in advance.