While reviews are scarce, the lobster chair has reviewed very well from a comfort and listening perspective. See here: https://positive-feedback.com/audio-discourse/impressions-the-gamut-lobster/
In relation to the headrest, this is the relevant extract from the review:
"Nor was the headrest neglected. Indeed, in many ways its design was key to getting audiophile-level performance out of the chair. As GamuT notes in its Lobster Chair product literature, "Normally you can't have a neck rest while listening to music, because you get a reflection from the material behind your ears, distorting the sound. But GamuT has created a unique acoustical damping material, resulting in an extremely effective sound treatment, while maintaining the Lobster Chair's breathtaking beautiful design and comfort. Furthermore the shape of the wide headrest also prevents reflections from [the] wall behind the listener [from] affect[ing] the soundstage, which eliminates the need for sound treatment behind the listener." In other words, there is no leather in the neck and head zone, but rather a fabric that acts to properly dampen the potential acoustical reflections in that area.
I can tell you quite categorically that it works extremely well."
What do you think?