NUK Evolution Straw Cup, 8 oz, 2-Pack

I just bought this last night and my LO was getting frustrated with it. I tried and I couldn't get anything out of it. I checked the straw and when the lid was off it worked but when I put the lid back on it stopped working. If I leave the lid only partially screwed on it will still work, but then my LO figured out how to unscrew it and poured water all over himself. It was a fairly spendy item and I really didn't find it worth the $$. I bought this one specifically because it had a straw that went all the way to the bottom and he prefers not to tip up his cups.

The straw design is TERRIBLE! My 2 year old kept giving me the cup back asking for drink when he already had something in his cup, I tried to sipping from it and nothing was coming out. Ended up having to stick a knife in the two air holes in order for the cup to work. Definitely not worth the price.

Doesn't leak but nothing comes up. Do I need to cut the part that hooks to the straw? Don't want to ruin it and no instructions say to do this but even I can suck any liquid up. I'll change my rating if I can get help!

Love these cups but the straw can be bit through very easily and they DO NOT sell the replacement straws and you must buy a new cup. Not worth it in my opinion.

I love this cup so much but have only had to replace it because the straw wears down and rip or my toddler has bitten thru. I cannot seem to find where to purchase replacement straws. It seems very inconvenient to have to replace the entire cup when the cup itself still is perfect beyond the straw. I have 12 of these cups currently and 3 toddlers using them between the ages of 11months and 3yrs old.