Are they really that bad? I must admit I didn't risk it but surely it'd last 6 months?

The pins used by the diagnostic software will be on the web somewhere. Standard ODBii cable probably won't work. I'd imagine that BMW anpa software probably would if you can get the right pins lined up.
There has been more than one post on the subject of premature water pump failure from ****part. If it rotates or reciprocates, don't use ****part, simples:)
 

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