This is a very impressive plugin.
Installation and setup is logical and straightforward, the UI is well laid out and easy to understand. The options for customisation are extensive and overall it's a joy to use.
Sorry this isn't more in-depth, but there's not much else to say really. It basically does exactly what it says, making creating niche amazon aff sites so fucking easy.
Here's a site I put up in literally minutes:
The Imagined Village (Yeah, I know it needs work, but it's a good example of how fucking easy this plugin is to use... and something I'm happy to share as I'd be amazed if anyone here has even heard of them let alone competing!)
Although it's near-perfect, there's a couple of small things that would bring it closer to perfection for me:
The option to search only the title. Some searches can bring up a lot of unwanted items, searching title only would be quicker than search, add neg matches, search, add more negs.
The option to map WPZonBuilder custom fields to other custom fields. I use custom fields a fair bit and have themes using stuff like brand or price for navigation. If I could easily map say amzn_Manufacturer to my_custom_field it would be really handy, especially for integration with other plugins such as a2p.
Additionally, and this is a bit bigger, geo-targeting would be a great feature.
Maybe use the maxmind db? (It works well with phpbay for example) Not sure how it would work as items are different on different sites, but just changing the links based on the visitors IP would be useful.
Overall I really impressed with this and highly recommend it. Forgot to mention the support is first class too.