Hi bermannyc,
You may be referring to the Casper mattress (which has a studio where you can test the mattress in New York) because Brooklyn Bedding is based in Arizona which is a long way from you. “Brooklyn” comes from the name of the owner’s daughter.
The better options or possibilities I’m aware of in and around the New York City area (subject to the quality/value guidelines here) are listed in post #2 here.
I’ve never slept on either one or compared them in side to side testing so I really don’t know how they would compare for me much less for someone else that may have a very different experience on the same mattress or may have a different opinion about how they compare.
I would keep in mind that there are no “standard” definitions or consensus of opinions for firmness ratings and different manufacturers can rate their mattresses very differently than others so a mattress that one manufacturer rates as being a specific firmness could be rated very differently by another manufacturer. Different people can also have very different perceptions of firmness and softness compared to others as well and a mattress that is firm for one can feel like “medium” for someone else or even “soft” for someone else (or vice versa) depending on their body type, sleeping style, physiology, their frame of reference based on what they are used to, and their individual sensitivity and perceptions. This is all relative and very subjective and is as much an art as a science. There are also different types of firmness and softness that different people may be sensitive to that can affect how they “rate” a mattress as well (see post #15 here).
For example a person that is heavier may sink into the mattress more deeply and feel more of the firmer layers that are deeper in the mattress while others that are lighter may only feel more of the softer layers that are closer to the top of the same mattress. In the end the only reliable way to know how firm or soft a mattress feels for you or how it compares to another mattress will be based on your own testing or personal experience regardless of whether it feels firm or soft to someone else or how anyone else may “rate” it compared to other mattresses as well.
Phoenix