The EIO Kids Cup is the perfect training cup for making that difficult transition from bottles and sippy cups to regular glasses.
EIO was generous enough to send me one of their cups for review. My daughter is still too young to start the transition process and would definitely throw this and make a mess since it's not spill proof. So I used it with my friends 2 and half year old daughter. She thought it was really cool and enjoyed using this rather than her sippy cup. It wasn't a flawless trial and she knocked it over and spilled some water, but that is inevitable with this type of transition. But the fact that she was interested and motivated is great. I think this is a great tool!