I had a look at Carol Vorderman site a while back and there was too much talking. At the time I decided it was too expensive.
We use Math Whizz and I/my kids think is fantastic. You start off with an assessment, but you have to say how confident you are at maths to give a starting guide, and depending on where you move the marker indicates how hard or easy the questions start at.
At the time I thought the questions were too easy, but in fact, it did mean the knowledge and strategies were taught properly from a basic level. I found that my kids had huge gaps, which I hadnt been aware of, and by watching them play the games, now understand how they are taught, learn and understand maths.
Whizz covers every aspect of the curriculum, some areas in more detail than others. SOme topics might have five or seven activities, others might only have one. They cover approx 17 topics four times in each school year.
The gimmick is maths age, similar to a reading age, but this isnt used in schools so doesnt really help, other than let you see how they progress in each topic and its very motivating to a child to see his/her maths age improve.
Reports are basic but adequate. All sites have different ways of showing you the information.
The teaching methods are fantastic and very easy to understand.
Just off to have another look at Carol's site. Its been a while.