It is triky, I must admit.
Our goal is to stay independent, with strong connection's to the brand!That is always hard to achieve without financial support, but one thing that is great is that you achieve to run this site without any serious help from B&O. Fact that they come to you is great success, and I'm really happy!
IMO the best way to stay independent and in same time to have strong connection with the company is to give company one section of site, let say link with name official reviews or official statements, so that they represent themselves and products in way they want. Not classical banners and commercial !
And B&O than should be involve in prize draw !
I think in that case we will keep our independence and everybody will have choice to read independent opinions and official once, which I think is a point !
In this model you will minimize potential influence from brand !
You know how it goes "when I paying I give conditions" ....