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I decided to give this a spin because I loved its magnifying glass icon. Turns out it does research into Amazon with laser-like precision, like a magnifying glass refocusing a ray of sunlight into a blade of grass.
One thing I liked most is that it shows all the information I need, like competitor's price, competitor quantity, and item conditions in one pop-up window. It also looks at all search results pages instead of just one, as one of its competitors does.
Most of all, you only need to do 1 search in Amazon, click on the Tool, and the information is displayed in a very convenient spot.
You can even download the results into a comma-separated spreadsheet.
Premium users also get to add Product Notes, a very handy tool that I think justifies the monthly that goes into a premium account.
Install this one to your Firefox (there's one for Chrome too), and you won't regret it.
Paid for the 3 month subscription on this and am happy to report that it is money well spent. This add-on is a huge time saver. What used to take hours can now be done with one or two clicks. With another click you can download the results into a spreadsheet. Do this multiple times at set intervals and you can estimate how much inventory is moving and who the big players are on any given listing. I already feel like I have a much clearer picture of the inventory levels and movements on a number of key listings. This is the vital data you need to make rational decisions on pricing--whether to compete aggressively for the Buy Box or simply wait for the competition to run out of stock.