Thoughts:
* It does what is says it does, it's useful in some situations.
* The brands list is incomplete.
* Suggesting missing brands needs to be improved, opening a pull request isn't a long term solution. Being able to suggest brands from the sidebar is probably the right solution.
* When browsing, you will have to keep going to the next page a lot, especially when the search term results in mostly drop-ship brands.
* Some automatic way of suggesting brands to the list would be nice, e.g. looking for a matching '.com' website corresponding to the name of the brand or doing a google search for the name of the brand and checking the amount of results is higher than a threshold.

Filters out the crap and in gives you better name brand results on Amazon

Nice

Very useful ! (well, will be when it works with amazon.fr). Thank you ;)