I bought a Nuby Mega Sipper cup when trying to transition my toddler from a bottle and sippy cup to a regular cup. This cup holds 12 ounces of fluid, which is more than most sippy cups hold. The wide mouth makes it easy to put ice cubes into it. It is easy for little hands to hold.
My daughter has never taken to this cup. She confuses it between her sippy cups that you must tip into the air, and this cup which has a straw and will spill the contents everywhere if you tip it up. We had a wet toddler many times before deciding to retire this cup until she got a bit older.
I do like the fact that there is a lid that flips over the spout, which protects it from getting dirty. My daughter did love sliding it back and forth.
Getting into the straw to clean it can be difficult.