6 months of use. So far it is GREAT! Loaded the unit with 24 bottles of water and 18 bottles of soft drink. Left in sun 4 days & nights the only cold item added was 16 pound's of ice 97 degrees. On the 4th day the bottles were still cold. If anything would've been prechilled I'm sure it would lasted longer. That job was over. Use this thing every week with no problems. I do like the lid straps as they are easy on/off. Don't hesitate to purchase the made in the USA cooler/ice chest.