Other benefits...
Tog rating - foam stuff tends to have quite a high figure which can
help comfort on uninsulated floors (concrete or wood variety).

Floorboard gaps - ripper/crumb rubber disintegrate quickly, foam might
be more tolerant.

Door clearance - 11mm will expose any doors that need the bottom
trimming, so back off any suspect hinge screws in advance :-)


The bounciness soon fades, it just feels "softer on joints" after a
few weeks. Furniture does wobble on 11mm, which might make things
irritating if say a desk or table with touch sensitive equipment on it
(you'll be poking and fighting the underlay).