I gave one of the 'light versatile' pillows as a present a few years ago. It was very well received and got lots of use pre covid. They are nicely made products with good materials. For someone who travels by plane or train or the likes a lot they are worth the money I would say. Moreso with the 25% off.
Is a heatbag just a fancy name for a hot water bottle?
It's like a microwaveable/boilable hot water bottle, no water necessary cos you can just microwave it. Then the top part is supposed to be denser so the heat only travels into you or something.