I have fairly thick, half curly dyed hair. When I recently had blonde highlights redone, my hair really suffered. When I washed it, it was matted from the roots. A small blob of Thermique easily spreads throughout my hair, and it detangles instatntly. The product is not at all heavy or greasy, it feel silky - I don't even feel the need to wash my hands afterwards, as it seems to make them soft too!
My hair looks shiny and soft. I havent been using it for long, so I can't comment on long term damage prevention, but I've never used a product which is as effective at detangling and leaving hair manageable.