I have a SXX TC in my B44 and SXX Comp in my X6. Why both types? - I didn't need the extra oomph that the TC will take for my 2WD so I decided to buy the cheaper version.
Both work superbly and I've never had the temp check go above 2 flashes (out of 10 max) on either of them. I also run the TC without a fan and it's fine right down to 5.5T.
Mind you, I'm not one of the fastest drivers around
