Use Word ML in Word 2000 or 2002

I came across another interesting Word XML related add-in called Polar WordML Add-In. The following description is on their site:

Polar WordML Add-In Alpha enables you to use WordML (Microsoft Word XML) format with Word 2000 and Word 2002 like native Word format. Once installed you can:

• Open all WordML files you receive as native Word format (WordML usage is expected to rapidly grow in the next few months and to become document standard for word-processing),
• Save your existing and future documents as WordML files.

I’d be interested if anyonehas given this a try and had success.