We've been using Aleks for a year, and I'm growing less impressed. It's not a good stand-alone curriculum, only really good for supplementation/practice, and the further out of level DS gets, the less I feel he's actually learning the material. He is being exposed to lots of concepts, but I'm not convinced he's mastering the skills in the way I would like to see.
Aleks also doesn't model problem-solving skills well; all it cares about is that you get the right answer, so there's no reinforcement for laying out a problem carefully and correctly.
I'm starting to work with Singapore Math as an offline alternative to address this.
DeeDee
