thankyou simon. Yes i did buy the carbon products versions. renewed all 4 , even though the slow speed earth was the only significant one in need of replacing. im not an aircon "must have on " driver , and so my demands for usage are by and large driven by cooling requirements. i have however made a note of the company details for future needs. Good to know that the long lifespan is as high as you suggest, so maybe i will stick with the " if it aint broke " opinion for now..
