[Perfectphoto]

I'm sure that this has been covered but I can find any info on this. I have a 06 Z4 3.0i 6 speed. The water pump went out and I need a new one. I buys a lot of parts for my four BMWs on Ebay and I have had some great luck. This is my first car with a electric water pump and I haven't replaced one before. The price difference is all over the place. What is anyone experience with the cheaper ones? I know that when you buy the cheap sensors like CPS they are crap but other stuff seems to be ok. Anyone that has experience with buying the cheaper water pumps I would love to hear from you. Thanks