Valeo Parking Sensors - any good?

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Just found out BMW want approx 1200 quid for retro-fit rear PDC so looking for cheaper alternative.

Has anyone had valeo beep & park kit fitted (audio only)? Seems cheap at around 170 quid inc installation. Do they work, and do they look ok?

[Jazoli]

I have bought Valeo ones in the past as I used to sell them and got a decent discount, I have to say that the £30 ones from ebay aren't really any worse though after fitting both types to several vans/cars in the family, none have failed in 5 years of use.

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Thanks Jazoli.

The only reason I am looking at the Valeo sensors are because they are fitted by one of the mobile fitting companies.

Has anyone used one of these companies for supply and fit?