I would like to say how happy I am with my IMS Guardian. I have had my Boxster almost 2 years and the Guardian installed about 1.5 years. It was the second major purchase after having had CV joints done. I drive it year round from +80 to -20F and don't worry about the engine. Will get the ims/clutch done a few years from now as the car only has 40k miles on it.
As Jake says be proactive with servicing. Frequent oil/filter changes are a must.