We have an online training certification site and we use Aktiv Mind LMS in order to host our training materials and administer our quizzes and testing. The pros of Aktiv Mind LMS is that it works across our entire mobile base. We provide our trainees with iPads and Aktiv Mind LMS runs perfectly on it. In fact we create our entire course using an iPad.
Support is great, we initially signed up for their base $39 a month plan but then upgraded to $349 per month followed by prepaying for the entire year which allowed us to receive a 20% discount.
Highly recommended, very easy to use.