My Take
This is a decent tool to create rubrics. I like that you can create a rubric very quickly. However, it is limited in that you typically can only create a rubric in one topic area, whereas many teachers use multiple items to assess students. I often download the rubrics into a Microsoft Word table so I can edit it and merge more than one rubric into one. This has worked well for my needs. I also put a weight on each item on the rubric . For instance, content would typically carry more weight that grammar. I usually give students a copy of the rubric ahead of time so they know the expectations beforehand.
How I Use It
This is an easy to use rubric generator. It is very simple to create rubrics on here. They are categorized according to topic as well which makes it easier to select items. There are drop down menus to choose the items you want to include on your rubric. It is very simple and does not include a lot of added features. You can create your own rubrics, but you can also peruse and use ones that others have already created.