I had the Clearshield done on my 04 and i held up well. Itwas an early 04 so the instller had problems with the kit an had to re-do it - nothing like hat happened to your E70. I did not have E70 done because I was not sure that they would get it right.

Having paid for my undergrad degree working in the accounting department of a car dealer, I can assure you that the non-manufacturer add ons had the highest margin. Paint protection was the best - a $50 wax job for $199.

Good luck with the dealer, frankly if they won't fix it I would raise the matter with BMW Canada. They are not really happy about dealers selling non-BMW products.

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07 X5 E70 4.8i
04 Z4 E85 3.0