User Memory in EPCGen2 Tag

I tested the EPCGen2 Class 1 tag today. Reading the EPCGen2 specification I was under the impression that most of the tag should support the 4 memory banks (TID, EPC, Password, User Memory) already and that I should be able to write a number of info to the User Memory. To my surprise I cannot actually do this. Based on discussion with the vendor, he said most of the EPCGen2 tags do not currently support the writing to this User Memory. It sounds weird to me. Though the standard said optional but this seems to be a basic feature that everyone needs in my opinion. I will appreciate if anyone can let me know if this is actually the case. The singulation mechanism in EPCGen2 (called inventory process in the standard) is pretty cool and fun to follow though.

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