I think the main issue is that it's locked down to the iPad. Hardly any school districts have iPads and there are a slew of "educational tablets" in the pipeli

I think the main issue is that it's locked down to the iPad. Hardly any school districts have iPads and there are a slew of "educational tablets" in the pipeline from manufacturers like Intel. I'd only build something with Apple's platform with the intention of reaching a limited consumer market. (Also, isn't pay-per-device cheaper for a school district than pay-per-student? Normally, multiple students share one device, or it's one to one.)