I deliberated over this one for ages when I needed pads all round for my X5. I'm a great believer in buying original parts and when I don't I generally have some small reason to regret my decision. Priced up the pads and sensors with my dealer, supply only as I got a local garage to fit, they were £280 after 10% discount. ECP I had looked at often and then a special 30% discount offer came on, got me the 4 pads and sensors incl delivery to NI which is more expensive for just over £90. It was a bit of a no brainer to save £200, went for Pagid pads and so far am totally delighted, they feel just like the original and actually are less dusty.
Go for ECP and stick to Pagid / Textar etc which are the OEM brands and you can't go wrong. My local garage fitted all 4 pads for 2 hours labour @ £25/hour = £50 , 2 hours in my dealer would have been near £200. Overall nearly £350 saved and a very reasonable full brake service completed.