i realise this, as with most dealer HU upgrades, will not be worth the money. but im wanting to get the HU upgraded before the wife sees the car

so is this just the HU or does it include new speakers as well and how does it sound?
i've had a wee search for this and not found anything about it on the net at all. Also is it spelt Cabase or Cabasse? Renault seem to spell it with one S but i've found a hifi company that is called cabasse.