Frontier Insurance- Any Experiences?

I'd never heard of them till today but they are coming top of pretty much any price comparison I have, and touting great reviews from Defaqto, Moneyfacts, Trustpilot etc.
https://www.frontierinsurance.co.uk/

Not cheap mind, but seems insurance prices are through the roof compared to our last renewal (Barclays bike insurance from £100 to £400!!) and they are better value than all the usual suspects for home and bike cover. Some options getting into 4 figures to cover home, contents and bike, that's way more than double our last renewal!!