Got back from Best Buy and got my Lumia 900
...not without some work though.
The manager called Best Buys product exchange centre and they said that burn-in was not covered by the exchange plan so I argued with him for quite a while that imo it was defective, but he was still pretty adament that he couldn't and wouldn't. I also stated that a different location would have done the exchange but they did not have the phone yet. We debated some more and he finally capitulated on the grounds that the other store told me one thing and his store another. Pretty proud of myself, usually I'm not inclined to argue like that. So I didn't have to pay anything for my 900 and I'm still at the same point in my contract. So happy.
Early impressions of the phone is that it is fantastic. I feel that it is a very nice jump from the Focus. The thing that really surprised me stangely enough was in the Xbox Live Hub when your avatar slides into the screen. On my Focus he was pretty sluggish, but on my Lumia he zips on to the screen fast and smooth. Really happy with the design, I can live with the black and the screen is very good. Now I need reinstall everything. Also tethering was enabled, which I didn't have on my Focus. Thats all I can think of for now.