Great for quick, formative assessment. Might not be suitable for all students.
I loved how there were many different ways to assess students (general quiz, competition, activities, etc). It adds a technological element to certain classroom practices that would have otherwise a) been done with paper handouts and b) not been able to measure each student's understanding as quickly and effectively. As stated above, cannot be sole form of formative assessment, for some students may not be comfortable in this type of environment. In contrast, I loved that it gave some students who do not feel as comfortable speaking up in class an avenue to express themselves.
How I Use It
Used for general survey of previous lessons' content. Extremely useful when teaching specific vocabulary words. Was not successful for a handful of students who generally need more time to answer questions, for they felt rushed and pressured.