I have a K2 and a YETI. In my opinion, both are good. However, the trick is to "charge" them before use. Load with ice while they are empty, and let them sit for a few hours. Empty the water, load them up and ice everything down. Then you will get the multiple days of ice they talk about. Got to keep them closed and latched. The latching is so important for performance.

I have a RTIC cup that works great for hot coffee. Not too sure about cold beverages,,,,,I drink my beer way too fast to worry if it stays cold.