And to be pedantic: I'm sure the ACCC could say your signature is misleading "No. 1 in WERS" when you actually mean "No. 1 in Aluminium Frame Awning style in WERS"
I agree, WERS is confusing... steer towards the clear glazed products e.g. 4/12/4... that tells you if the window performs. The glazing types just add to the confusion, but you can choose that after you choose your window. Check the product ID, the same ID means many are the same window manufactured by different companies. I suggest looking at awning windows because you have to set some standard, the fixed windows always outperform the opening windows because they use a different standard.
I am limited in the words I can use in a signature... the claim is qualified in all of our literature. Out thermal break is available just needs the energy rating to be completed.
Ed