Really like this product. There is so much under the hood and so much data available, it can help you make product decisions for what to sell on Amazon and gives you a lot of data to chew on. There's so much data and so much to learn that they include 11 short videos with the product. For $97 or so per year, it's a great value.
Their customer support is good. There is live chat available (not all the time) and they are very responsive on email.
If you are selling on Amazon, you need ASINspector Pro. You will learn a lot about the categories that you want to sell it or the categories that you are already selling in.