I got one of their mugs, and I have to say it's helped me save money. I used to never make coffee at home, because it was cold by the time I got to work 30 minutes later (don't like chugging coffee while driving). But I can brew at home, take it to work, and it will still burn my tongue at lunch.
also, I got one for the wife (for her birthday). She's the one up all night taking care of the baby, and if she can have a big glass of freezing water without wandering down the stairs, it's worth it to her (and me!).
They are a great product with a crazy cult following. I'm fine with the off brand, but I will be replacing all my summer cups with versions of these. There's something really worth while about an ice cold drink in the Texas heat that makes life just a bit better. Used to be Tervis, but Yeti ice will last for days.
I don't see a need for the cooler, but I don't spend a lot of time overlanding. Those that do, this works like a fridge. Personally, I would buy a travel fridge since they are about the same price, but again not a need for me.