Keep in mind people generally tend to write a review when they have had a bad experience, so I doubt you will find many good ones. Avoid the known cheap ones. I'm with LV, always seem competitive and I believe are amongst some of the better insurance companies out there.
Is anyone in the insurance game? A forum sponsor with a cheeky discount for members would be good! There was a chap on a CTR forum I used frequent who offered his services and saved a lot of people a lot of wonga, and definately increased his sales by a fair few. Win win for all!