Spark Island anyone used it?

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I've just had a look at the Spark Island website and my dd (age 7) is enjoying it very much. We are on the free 14 day trial at the moment, the cost is £49 a year once that runs out.

Has anyone used it, and do you think that it is worth the money?

Do any primary teachers use it and how well does it work? It seems to cover a lot of the ks1 and 2 topics, and the kids are enjoying it, but does it keep their attention?