I have a Rambler like that but it's incredibly heavy. I wouldn't want to carry it around, but it's good for if you take it somewhere in the car, for example, or a picnic basket, keeps things cold for ages.
I don't have an ice/water machine on the fridge though, and I find that if I fill it from the tap and put it in the fridge, the water doesn't get cold for many hours, either - so the insulation certainly works, but not quite in the way I needed!
I don't like the straw ones as I can never get the bottom of the drink, and I find them harder to clean. I like the ones with a pop-open lid that just has a hole that you then tip up and drink from. At the moment I have Contigo, which is lockable against leaks, pops up to open to drink from a hole (other lids are available), but the one I have isn't insulated. I think they do some like that though.
I'd only get one where all parts can go in the dishwasher!