There is a lot of wireless networking equipment available that claim to follow either the 802.11n final specification or, alternatively, (one of) its draft versions. Are there any appreciable differences in functionality between the final and draft 2.0 versions of the specification? For example, is it possible for devices following different versions to be incompatible?
Edit note: The original question targeted draft 2.0. However, this question is probably relevant to any of the draft versions. Draft 2.0 also happens to be the first released version, and is used on many devices.