I think it might be a little bit risky for toddlers because you're not sure what kind of materials they used for that and they might have included a hazardous kind of plastic. Aside from the health issue from the plastic, I also agree with Joey that it's unsafe for toddlers to be exposed to gadgets for a long period of time.
From experience, the ones they sell in Greenhills are a bit heavier and harder than ones you can purchase in apple stores etc. but I guess they're safe. Just don't leave it with your todller for a prolonged period of time.
It is actually safe for toddlers. What's unsafe is, long time usage of tablets or gadgets for other kids for it affects the their eyesight.