Hi Polskifil,
The value of a mattress purchase depends on how two specific mattresses compare to others that are available to you based on the parts of your personal value equation that are most important to you and is relative to your specific criteria in a mattress including PPP. Having said that … all of these are open and transparent about the materials they use in their mattresses and are knowledgeable and experienced and provide good guidance to their customers (which are all part of the value of a mattress purchase). I would consider any of these to be well worth visiting and wouldn’t hesitate to make a purchase from any of them.
Phoenix