As an 8th grader currently using Savvas in class, I must say that while Savvas does a decent enough job as a tool for teacher review and student work submission, there are some glaring issues.
Primarily, Savvas is excessively slow and sluggish, as it takes a full minute or so to load any given lesson. It slows down even more right after school, which I can only guess is because of increased site traffic. I will often spend a good 7 minutes solving a complicated one-part geometry question, only to hit "Check answer" and get it caught in a buffering loop, forcing me to reload the tab and have to answer a new question.
Savvas is not capable of being the primary learning source. Its "View an example" and "Help me solve this" buttons are great, but only once the student understands the lesson. Our teacher makes sure to go through the lesson and 5 examples of the lesson before assigning homework to us on Savvas.
Overall, while a great improvement from the previous resource my school used, Assistments, Savvas Realize is not a great classroom resource. It is, however, a good way of checking student answers and ensuring understanding of the lesson. I can't help but feel that pencil & paper would be faster, though, with how uselessly slow this website is.