I recently read the review of the ThermoEngine at http://www.hardocp.com/reviews/cooling/themosonic/v604210/ it says that the TIM included on the heatsink worked as good as the thermal grease they use. I bought the ThermoEngine and I'm still waiting for it to arrive. If anyone has a ThermoEngine, please let me know what you think about the TIM, or if I should just buy some thermal grease; thanks.