Just used it to buy some vitamins. Didn't work on some items (e.g. CLO). Seems to be sitewide. Sort of.
Also 11% for
DOUBLE11 js single use per account.
SINGLE11 is multi-use.
Free shipping via AusPost from $55.65, but no greater than ~$170.
Don't forget +8% CR cb.
Edit: Damn, just realised I forgot to use the referral link! Now I'm definitely going to OzBargain hell…
Damn 2: Cashback is now 20%!!