78k miles on my '04 330Cic and the coolant system works great. No leaks, hoses feel normal not hard or cracking, water pump & clutch fan quiet. I am slowly piecing together all the components needed to for a coolant system overhaul. Not in a hurry but I know it's one my to do list for my Vert (hello all metal WP).
I just finished the VANOS seal repair kit and replaced the PS - ALT - WP drive belt cause I noticed cracks in the old one. Also while I had the clutch fan off I cleaned the front face since it had lots of road grime and dirt on it. It cleaned up very well. Maybe one day another project will be to replace the clutch fan for an electric one... so many projects so little time (& $$$).
2004 BMW 330Ci Convertible