Hi kc12,
Whether or not something is a “deal breaker” would come down to your own personal value equation. With this design I would advise a very slight caution for someone in the mid 200 pound range or so or above with 1.8 lb density core, but this mattress uses very high quality materials, especially the new ultra high-density TitanFlex polyfoam and the higher ILD in the polyfoam base. It’s not something that would objectively “disqualify” someone over 200 pounds from purchasing an item like this.
Phoenix