I have one of those polished steel ones, trouble is one cannot see if its full or empty at a glance, the lid must be taken off every time it's checked. It also doesn't have a large enough capacity. When it's hot the tank is filled completely, when it's cold it's empty. I've never had to add any coolant as the tank has the same capacity as the amount expanded out of the rad but it would be nice not to have to open the rad to confirm. A plastic one such as Ordy's would make more sense.