I have never used or even see them in my classes but I consider them as easy tools to make children understood what they have to do in every task.
Sometimes, you don't feel like creating a rubric to define the goals of an assignment but Rubriestar gives you the chance to save energy and a lot of time, as they have different kind of tasks available.
Besides, if you have to change the criteria or create one you only have to type it!
I didn't come up with interesting homeworks the day that I was creating my rubric, so that I set up the first tale competition! Writing and reading literature is really useful and rewarding, and if some of the students has problems to organize her/his tale I gave them the right clue.
But I can do the same with Geeography or History projects, biographies, ... and establish the criterias using Rubriestar!
Thank you! : D