Then why are they offering it in retail stores like best buy? Sucks that you buy something for feature X and few days later an update comes through getting rid of it. Does anyone know how hard is it to reverse this update?
You really shouldn't buy products because of an un-official feature hidden in a preview of a developer SDK.
There is an unofficial way and that is putting your device in developer mode.
Microsoft is bad at many things, but until recently, they were very good at backward compatibility. They knew people were using undocumented APIs, so they went out of their way to preserve bug-for-bug compatibility in a lot of cases.
On the other hand, they also went out of their way to use undocumented APIs and API changes to give Word an advantage over Word Perfect....
Once you get to prices this low, the idea of "service" becomes somewhat different. It does what it does. We won't get traction with Google by whining about this sort of thing.
The point is that the distinction doesn't matter, so any argument (for or against) predicated on what the buyer expects or what the seller advertised is limited to the ability to refund the purchase price -- it's a dumb argument, basically. It does what it does.