This is my workplace tumbler and I couldn't live without it. I absolutely abhor room-temperature water, I will only drink it ice cold, so I struggle to get my 8 glasses on work days since lounging with a glass of ice water isn't an option. I bought the basic black and a pack of neon straws, and it's become my sidekick. I fill this up with ice and water in the morning and refill a few times throughout the day, but when i clean it at the end of the day the ice is nearly perfectly in tact. I love that this keeps the drink ICY without sweating up the sides of the cup or being cold to the touch. I can honestly say that this thing has helped me get more water into my diet and performed like a dream.