Digital BW, The Print

I think it may have been mentioned here, but a search returns no info, 
Costco now is selling Kirkland Signature in 4x6" sheets.

HOWEVER, it's made in the U.S.A. (awesome!) and is 10.4 mils.

Anyone test this paper to see if it's acid-free (Paul?)?

Anyone try it? Thoughts?

BTW, it is $13.99 for 300 sheets.

Scott