In the SqlUserDefinedType attribute you can tell it to use byte ordering, which is what I do.

I get the same execution plans as the article author. This leads me to believe that it is serializing then filtering.

I also built octet accessor properties into my UDT, these...

You can store a UDT using much less space if you define the serialization methodology. The IP UDT I created serializing to bytes has the following stats when tested using...