I quite like some of the questions, which present the topic in some interesting examples and more like some of the applied exam questions. It is a shame they are mixed in with some less useful questions, though. I also like that (at least the way local schools have it set up) students have to practise previous topics regularly. I don't like that the videos show exactly how to do specific questions, rather than a more general understanding of the topic. And the bookwork codes seem tedious, and don't encourage written working out anyway, as pupils just end up with a long list of random number answers. Schools here also require 100% done, and done correctly, so I don't think the alogrithm does much to adapt, apart from possibly looking at the time it takes to do it, because students end up getting help for the difficult questions in the end if they aren't sure, so it doesn't help to tell parents not to get involved, as someone has to help!
But it's more the admin side of it that can be a pain; the actual questions I think are generally quite good, though I still preferred Mr Hegarty videos.
I find is less irritating that trying to get the right answers inputted on MyMaths or MathsWatch, and those questions really were repetitive.
At least on sparx you can leave part way and do a few each time, and there isn't a lot of copying down of questions. There is something to be said for having a required number that you have to do correctly, as with Mr Hegarty or other programs, pupils would get, say, 30% on a topic, and nothing ever happened - no follow up, no further explanation, etc. I'm not sure forcing 100% is the way to go either, as it means weaker students can just get totally stuck - there should be a way to skip somehow and let the teacher know.