I decided to splash out and bought a Crater. The first unit had a few problems and had to be returned after a couple of days
I should have bought one straight away and saved a lot of money and a shed load of aggro! Highly recommended
it keeps drinks warm for an adequate amount of time. Cons: the design is awful. The cap frequently leaks and gets stuck so it's impossible to open. It is the most poorly designed travel mug lid I've ever had. I've had it less than a year and it's completely unusable now
or they hide/remove negative reviews instead of improving their products. Overall