*Advertising supported.
* locked to Amazon's market
* a not-quite-standard version of Android.
* No SD card.

No thanks, for my use. The one thing that seems cool to me, despite that, are the 16:10 screen (for some things, a nice step between the 16:9 of most Android tablets, and the 4:3 Apple uses).

I haven't seen an 8.9" tablet to have a sense how the size compares to the 9.7/10.1" standard; I've found absolutely no use for the bigger size (anything I might do with that, I can either do more conveniently on a 7" or can do better on a subnotebook with a real keyboard) but people do like their iPads, and the 8.9" form factor might just be enough smaller to be worth getting for those of us put off by the larger tablets.

Trying to think more generally:
The $159 Fire SD looks like a pretty good deal for those wanting a bare-bones mostly-an-eReader device.

I'm not sure who the HD 7" would be good for, when the Nexus 7 is the same price with no real down-side. Basically, just the Amazon tie-ins for those who are in their ecosystem.

The 8.9" is priced very attractively compared to 9.7"/10.1" tablets, and for those who want a larger one mainly as an eReader and streaming media player, it seems it might be enough cheaper to justify the lack of some capabilities...

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Also haven't seen if these have GPS or not, which was missing on the original Fire.

Don't try telling mooper that. *lol*