The benefits, or otherwise, of online quizzes in education are the subject of much debate, and their value in terms of student learning and engagement is disputed. In 2014/2015, in response to the challenges of assessing large numbers of students, we replaced a paper-based quiz with an online quiz to assess over 200 students. A bank of over 200 questions aligned to the learning outcomes of the module was created. As each topic in the module was delivered, an online formative assessment quiz focussing on that subject was made available to the students. They could attempt it as many times as they wished. Formative assessment was not previously an option in this module. When students submitted their formative assessments they were automatically graded online and immediate feedback given. The summative assessment had questions that were randomly selected from those used in the formative assessments making it advantageous for students to engage with the formative assessments. The main concerns with the paper based quiz were lack of flexibility for students, the potential for marking errors, delayed feedback, and its time and resource intensiveness. The online alternative addressed these issues; once opened formative quizzes were continually available and could be attempted repeatedly. They were marked automatically and prompt feedback given. Time and resources are no longer needed to photocopy papers, manually mark questions, enter results, and give feedback to students. This flexible, student centred approach has been used each year since 2014/2015 allowing us to collect a large bank of data. This paper will present our analysis of the data to further add to the debate in relation to the value of online MCQ quizzes in terms of student learning and engagement.