I am on year 8 for my 120 quart or so Igloo cooler from Costco. It needs hinges every other year, but other than that, it has been an outstanding cooler. I don't think twice about leaving it on the boat.....
I have had my Yeti for over 8 years and it still looks like the day I bought it. I don't spend a lot of money on gear but this was one luxury that has paid off. I also have an igloo and they work well but the hinges and latches failing every two years is a pain.