Thanks y'all for the information. I took advantage of the coupon offer and signed my kids up.
They work on 2-3 lessons per day and levels seem to be okay for both. They can answer most of questions correctly but take some time figuring out some of tougher questions. My son (more mathy of the two) has easier time solving the questions and I saw him help his sister solve some questions, too. DD (harder worker of the two ) takes more time, but goes through explanations and videos and seems to be learning a lot.
They both tell me that questions are much more challenging-- not that they enjoy more because of that, but seem to be okay with it.
I'm thinking about buying some books to try out after this trial period. They both like comic books but it is hard to read on screen. Another thing is that some problems are a lot easier to figure out on paper than on screen.
Hope to report back when we get books and are able to compare.
