Ian G.
Took the leap and bought the 4 pack over a month ago. Love them, down to 3 as my wife has took the green one. Great product and the size fits nicely in all the cup holders in several different vehicles.
Only small issue I would have is that the opening is quite small and if at the gym, I struggle to get a good gulp of water from it. That said, I often take the lid off and find it very comfortable to drink from them without the lids.
The whole 'no plastic thing' convinced me to try them and the ...