i spoke to a rep from aeroboard at a show once and he informed me the difference between finlite and quinnlite is day and night,the quinnlite has much much better insulation properties.i read in another forum that the finlite has about the same insulation of half inch aerobord (probably white polysterene stuff)i think the price is very different also,ask your plasterer about either of them they dont tend to like plastering them due to the way they absorb water,some dry line over them then skim.other forum said they're good for rising walls to help reduce cold bridge