CBABDAY
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I just got sent an email from the Commonwealth Bank with a 'birthday offer' to save $20 when you spend $79 or more at RedBalloon. The coupon code looks to be generic.
I can't vote on this as my account is too new, but if I could, I'd be voting a big, fat no.
The terms and conditions attached to these vouchers are horrendous. Dates and times offered by providers to redeem for 'experiences' are often inflexible (e.g. there is one car rally experience that offers 2 days a year!), leading to vouchers expiring before usage is possible, and by all accounts, customer service is regarded very poorly.
See http://www.productreview.com.au/p/redballoon-days.html
And finally, most of the 'experiences' can be found for half price, or less, through the group buyt sites. Not a bargain - avoid at all costs!