Yep, I just took advantage of this one.
I'm a long time lurker from way back and was still using my original Kindle 1 I bought at launch.
I thought that the Kindle with special offers was a great way to upgrade to the K3, especially if the offers continue to be as good as promised - it will basically reduce the price of the device.
I have taken advantage of the $10 for $20 and the $10 credit for buying a bestseller offers already, so I'm very happy with it (and can't believe how much better the K3 is than my K1!). I spend money at Amazon anyway, so these offers are not going to make be spend more than I normally would, but they will lower my costs.
Hopefully they will continue to be great offers.
So far, very pleased with the device, and the ads (non-offer ones) are a complete non-issue for me.