If you want the product for making feed grids or for making single category grids its good.
However, I gave it 3 stars because I wanted to use it for woo commerce. You CANT filter by attributes, and you definitely cant filter a specific category by attributes.
For example, If you have a category called books, and in books you have books with attributes of paperback or hardback and another attribute of Braille or large print. You won't be able to filter the grid to have a book (category) thats paperback (attribute 1) and in large print (attribute 2). It simply doesn't work.
Also, the documentation isn't great, although the videos will show you the basics, its pretty much you've got to play around with it to make it work.
You need to know the queries is only query for order of items, e.g date of post.
Also try selecting from the source tab an item from the top and an item from the bottom, it highlights every item in between which is a pain for when you come to filters because you have to untick every single thing you dont want in the middle of the list.
One last thing, although. I may be wrong but I couldn't find any documentation, try making 44 grids like I was, you can template a skin (the way it looks) but you cant template the actual sources or the filters or their layouts, you have to start from scratch for every single one.
(woo commerce has an extension to filter by attribute if you do need it, but it won't work in this I've tried, you just have to find another grid make)