I have a Yeti 65. It is amazing.
Now, let me qualify that statement. I received it for free (theoretically), as a result of a sales promotion when I bought about $3K worth of products I would have purchased anyway. In no universe is a 65 QT cooler worth $400. Sure, you can find it on sale for about $350. Still not worth it. And actually, its more like the size of a 50 QT cooler, not 65.
Yes, it holds ice much longer than other coolers. I typically use Igloo Marine coolers, which are excellent, and the Yeti out-performs it hands down. It held ice in my hot Florida garage for about 4 days before it all finally melted. Maine in October for 2 weeks...I don't see why not.
The thing I like about it the most is that it keeps the ice as "ice cubes" rather than chunks of ice. In other coolers, the ice more/less molds together as it melts. But in the Yeti, the ice stays in the cube form until it melts. That alone is huge benefit.
The key is to put cold/frozen items in a cooler that's not hot on the inside. In Yeti's literature, they even tell you to "pre-cool" the cooler prior to use.
Regarding quality, there's not another cooler "type" on the market that is any better. There are a few Yeti look-alikes which are built the same, and I can imagine their quality is just as good. The construction of the cooler is extraordinary. Everything from the hinges to the latches to the handles and beyond is top-notch. When you open the drain, guess what...it drains all the way. Nice rubber-type feet on the bottom that prevents it from sliding around. All-around superior design.