Guys, put yourself into the sales person's shoes. How would you convince someone to buy a Lumina 900 over an SGS2, for example. You can't push the Lumina's processing power, because it doesn't have it. You can't push the Lumina's app store, because it pretty much doesn't have one. You can't push accessories, because it doesn't do near the volume as iDevices or Android devices. You'd have a hard time pushing the UI because, at best, its usability is subjective and someone isn't going to get a feel for it in 5 minutes. You can't sell it on price, because its 100 bucks on contract, and contract pricing is identical among all smartphones on a given carrier.
An SGS2 or HTC One X can sell themselves. They have large, beautiful screens, fast CPUs, multiple app stores with a few hundred thousand apps for every possible need or desire, ultra fast network speeds, and with a little bargain hunting, its easy to beat the Lumina 900's 99 dollar price.